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AI models
meta

Muse Spark 1.2

AI model Released

API mode
Chat*
Context window
1,048,576 tokens
Maximum output
131,072 tokens
Open weights
No

Capability & preference

General capability · ECI

A cross-benchmark capability estimate. Index points, not a percentage; intervals show uncertainty.

Muse Spark 1.2 155.2* Muse Spark 1.2 · 95% interval 152.9–157.6

Human preference · Arena

Overall text preferences from head-to-head votes. Not factual accuracy or a task-success rate.

Muse Spark 1.2 1482.7 Muse Spark 1.2 (xHigh) · 95% interval 1476.3–1489.0 · 11,724 votes · 2026-10-28

Model performance

Radar task score: four tests, equal weight. An experimental summary of these tasks, not a universal intelligence rating.

Muse Spark 1.2

Radar task score

Unrated

1/4 core tests · not enough evidence

1 benchmark results for this configuration

Scientific reasoning

GPQA Diamond · 25%

Expert-written science questions; strict multiple-choice scoring. Chance accuracy is 25%.

Muse Spark 1.2 Not available

Novel problem solving

Mystery Game Puzzles · 25%

Best-next-move puzzles in an undisclosed game variant. A narrow reasoning test, not general intelligence.

Muse Spark 1.2 Not available

Advanced mathematics

FrontierMath Tiers 1-3 · 25%

Private v2 mathematics problems with Python tools. Earlier versions and Tier 4 are excluded.

Muse Spark 1.2 Not available

Factual answers

SimpleQA Verified · 25%

Correct factual answers under a guessing prompt, graded by a model. Not a hallucination or abstention score.

Muse Spark 1.2 60.3*% Approx. 95% interval: 57.3–63.3%

Bars show reported task scores. Whiskers are approximate 95% intervals where standard errors are available. Different reasoning budgets are not equal-cost tests. Missing results are never zero.

Recorded results

Only the same benchmark, version, workload, scenario and unit share a row. Missing results are not zero. System results include the full submitted hardware and software configuration.

Arena text preference / chinesehuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,510.17 rating

Confidence interval: 1,490.79 – 1,529.55

1000 votes

Category
chinese
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / codinghuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,505.90 rating

Confidence interval: 1,494.58 – 1,517.21

2987 votes

Category
coding
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / creative_writinghuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,436.88 rating

Confidence interval: 1,423.98 – 1,449.78

2491 votes

Category
creative_writing
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / englishhuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,484.13 rating

Confidence interval: 1,474.94 – 1,493.32

4605 votes

Category
english
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / exclude_tieshuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,491.90 rating

Confidence interval: 1,483.44 – 1,500.35

8690 votes

Category
exclude_ties
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / experthuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,477.13 rating

Confidence interval: 1,460.11 – 1,494.15

1217 votes

Category
expert
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / frenchhuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,499.66 rating

Confidence interval: 1,469.44 – 1,529.88

425 votes

Category
french
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / germanhuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,491.61 rating

Confidence interval: 1,448.41 – 1,534.81

184 votes

Category
german
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / hard_promptshuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,491.64 rating

Confidence interval: 1,483.93 – 1,499.36

7435 votes

Category
hard_prompts
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / hard_prompts_englishhuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,490.57 rating

Confidence interval: 1,479.29 – 1,501.85

2961 votes

Category
hard_prompts_english
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / industry_business_and_management_and_financial_operationshuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,483.53 rating

Confidence interval: 1,470.00 – 1,497.06

2063 votes

Category
industry_business_and_management_and_financial_operations
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / industry_entertainment_and_sports_and_mediahuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,442.13 rating

Confidence interval: 1,430.39 – 1,453.87

2995 votes

Category
industry_entertainment_and_sports_and_media
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / industry_legal_and_governmenthuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,508.71 rating

Confidence interval: 1,488.68 – 1,528.74

914 votes

Category
industry_legal_and_government
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / industry_life_and_physical_and_social_sciencehuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,499.20 rating

Confidence interval: 1,485.16 – 1,513.23

1861 votes

Category
industry_life_and_physical_and_social_science
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / industry_mathematicalhuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,488.30 rating

Confidence interval: 1,464.67 – 1,511.93

632 votes

Category
industry_mathematical
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / industry_medicine_and_healthcarehuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,493.92 rating

Confidence interval: 1,472.36 – 1,515.48

811 votes

Category
industry_medicine_and_healthcare
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / industry_software_and_it_serviceshuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,507.79 rating

Confidence interval: 1,498.23 – 1,517.34

4340 votes

Category
industry_software_and_it_services
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / industry_writing_and_literature_and_languagehuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,451.15 rating

Confidence interval: 1,439.94 – 1,462.35

3300 votes

Category
industry_writing_and_literature_and_language
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / instruction_followinghuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,464.84 rating

Confidence interval: 1,454.98 – 1,474.71

4092 votes

Category
instruction_following
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / japanesehuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,470.18 rating

Confidence interval: 1,428.32 – 1,512.05

197 votes

Category
japanese
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / koreanhuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,454.44 rating

Confidence interval: 1,417.64 – 1,491.25

239 votes

Category
korean
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / longer_queryhuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,473.80 rating

Confidence interval: 1,464.64 – 1,482.96

5113 votes

Category
longer_query
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / mathhuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,484.63 rating

Confidence interval: 1,461.18 – 1,508.08

615 votes

Category
math
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / multi_turnhuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,496.16 rating

Confidence interval: 1,481.17 – 1,511.14

1727 votes

Category
multi_turn
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / non_englishhuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,475.17 rating

Confidence interval: 1,467.30 – 1,483.05

7118 votes

Category
non_english
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / overallhuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,482.66 rating

Confidence interval: 1,476.33 – 1,489.00

11724 votes

Category
overall
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / russianhuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,480.90 rating

Confidence interval: 1,465.24 – 1,496.56

1535 votes

Category
russian
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference
Arena text preference / spanishhuman preference · 2026-10-28 · rating

Muse Spark 1.2

1,490.75 rating

Confidence interval: 1,461.25 – 1,520.25

383 votes

Category
spanish
Evaluated configuration
Muse Spark 1.2 (xHigh)
Evaluation type
human preference

Run it locally

Inference · memory estimate

Muse Spark 1.2

Closed weights. No supported local deployment or GPU requirement is published.

API cost

USD / month

Standard text-token estimate. Excludes taxes, caching, batch discounts, reasoning and multimodal surcharges. Provider limits and regional availability may differ.

Muse Spark 1.2

Capabilities

Context window
1,048,576 tokens
Maximum input
1,048,576 tokens*
Maximum output
131,072 tokens
Reasoning
Yes
Tool calling
Yes
Structured output
Yes*
Open weights
No
API mode
Chat*
Image input
Yes*
PDF input
Yes*
Parallel tool calls
Yes*
Prompt caching
Yes*
System messages
Yes*
Tool choice
Yes*
Web search
Yes*
Model license
Proprietary

Input modalities

  • text
  • image
  • video
  • pdf
  • audio

Output modalities

  • text

System configuration

Detailed specifications

Specifications · 24 fields
cache read input token cost
1.5e-7*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
input cost per token
1.25e-6*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
litellm provider
meta*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
max input tokens
1,048,576*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
max output tokens
131,072*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
max tokens
131,072*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
mode
chat*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
output cost per token
4.25e-6*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
search context cost per query
search_context_size_high
0.0025*
search_context_size_low
0.0025*
search_context_size_medium
0.0025*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
supported endpoints
  • /v1/chat/completions*
  • /v1/responses*
  • /v1/messages*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
supported modalities
  • text*
  • image*
  • video*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
supported output modalities
  • text*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
supports function calling
Yes*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
supports minimal reasoning effort
Yes*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
supports parallel function calling
Yes*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
supports pdf input
Yes*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
supports prompt caching
Yes*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
supports reasoning
Yes*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
supports response schema
Yes*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
supports system messages
Yes*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
supports tool choice
Yes*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
supports vision
Yes*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
supports web search
Yes*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*
supports xhigh reasoning effort
Yes*
Scope and conditions
native_context
provider
meta*
mode
chat*
full_native_model_id
meta/muse-spark-1.2*
pricing_scope
Literal source field names and values retained; provider, region, cache/batch/threshold conditions and per-unit meaning must be checked. max_tokens is not automatically a context limit.*

* Provisional data