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Comparison of clef-flash, Step-5-Preview, Meta: Muse Spark Open
3 modelsUnknownclef-flashRemove ×stepfun-aiStep-5-PreviewRemove ×metaMeta: Muse Spark OpenRemove ×
What’s different65.5K context600B total and 27B active parameters; accepts images and video, with FP8 and BF16 weights for deployment.OpenRouter lists a 1,048,576-token context and up to 943,718 output tokens for this open-weight model aimed at agentic coding.
DateOct 16, 2026DiscoveredSep 18, 2026ReleasedOct 15, 2026Released
Listed rate$0.09 in / $0.00 out/ 1M tokensExperiential · all routes ↗Standard list rate$1.00 in / $2.70 out/ 1M tokensDeepInfra · all routes ↗$1.25 in / $4.25 out/ 1M tokensbaseten · via Hugging Face · all routes ↗
Provider endpoints1 endpoint →6 endpoints →8 endpoints →
AA Intelligence ↗4.3.2Not reported43.73 ↗Effort not specifiedIndependent result38.87 ↗Effort: xhigh · XhighIndependent result
AA-Briefcase ↗1.1Not reported1,424.32 ↗Effort not specifiedIndependent result1,279.37 ↗Effort: xhigh · XhighIndependent result
GDPval-AA ↗2.1Not reported1,586.63 ↗Effort not specifiedIndependent result1,401.12 ↗Effort: xhigh · XhighIndependent result
AutomationBench-AA ↗AA Index 4.3.2 collectionNot reported50.96% ↗Effort not specifiedIndependent result49.71% ↗Effort: xhigh · XhighIndependent result
Terminal-Bench 4.0 · AA ↗Not reported33.33% ↗Effort not specifiedHarness unreportedIndependent result8.08% ↗Effort: xhigh · XhighHarness unreportedIndependent result
SciCode ↗AA Index 4.3.2 collectionNot reported58.91% ↗AA · Under reviewEffort not specifiedIndependent result58.45% ↗AA · Under reviewEffort: xhigh · XhighIndependent result
Humanity’s Last Exam ↗AA Index 4.3.2 collectionNot reported46.48% ↗Effort not specifiedIndependent result43.88% ↗Effort: xhigh · XhighIndependent result
GDP.pdf ↗AA Index 4.3.2 collectionNot reported14.8% ↗Effort not specifiedIndependent result18.6% ↗Effort: xhigh · XhighIndependent result
CritPt ↗AA Index 4.3.2 collectionNot reported20.86% ↗AA · Under reviewEffort not specifiedIndependent result14.86% ↗AA · Under reviewEffort: xhigh · XhighIndependent result
AA-Omniscience ↗AA Index 4.3.2 collectionNot reported16.38 ↗Effort not specifiedIndependent result24.65 ↗Effort: xhigh · XhighIndependent result
AA-LCR ↗1.1Not reported88.33% ↗Effort not specifiedIndependent result78.33% ↗Effort: xhigh · XhighIndependent result
LiveBench ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported62.01% ↗Effort: max · single run · equal mean of 7 suitesIndependent result57.57% ↗Effort: max · single run · equal mean of 7 suitesIndependent result
LiveBench Design ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported76.9% ↗Effort: max · single runIndependent result60.3% ↗Effort: max · single runIndependent result
LiveBench Research ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported72.8% ↗Effort: max · single runIndependent result80.3% ↗Effort: max · single runIndependent result
LiveBench Browser Use ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported24% ↗Effort: max · single runIndependent result36% ↗Effort: max · single runIndependent result
LiveBench Coding ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported85.6% ↗Effort: max · single runIndependent result73.6% ↗Effort: max · single runIndependent result
LiveBench Agentic ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported27.5% ↗Effort: max · single runIndependent result18.9% ↗Effort: max · single runIndependent result
LiveBench Data Analysis ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported63.5% ↗Effort: max · single runIndependent result60.2% ↗Effort: max · single runIndependent result
LiveBench Reasoning ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported83.8% ↗Effort: max · single runIndependent result73.7% ↗Effort: max · single runIndependent result
Context window65.5K1M1M
Max output—64K943.7K
Parameters———
Tool callingNot reportedSupportedSupported
Structured outputNot reportedSupportedSupported
Image inputNot reportedSupportedSupported
Audio inputNot reportedNot reportedSupported
Video inputNot reportedSupportedSupported
ReasoningNot reportedSupportedSupported
Prompt cachingNot reportedSupportedSupported
Open weightsNot reportedSupportedSupported

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