Model comparison
Composer 2 Fast vs Muse Spark
Head-to-head evidence from 0 shared benchmark results across 0 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Composer 2 Fast unranked (Not scored); Muse Spark #16 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Composer 2 Fast and Muse Spark share 0 comparable benchmark results. 0 of 8 categories are comparable. 1 result is unique to Composer 2 Fast; 39 to Muse Spark.
Updated July 28, 2026- Shared results
- 0
- Composer 2 Fast only
- 1
- Muse Spark only
- 39
- Comparable categories
- 0 / 8
Benchmark data for Composer 2 Fast and Muse Spark is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 0 shared benchmark results across 0 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
Muse Spark has the larger context window at 262K, compared with 200K for Composer 2 Fast.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Composer 2 Fast | Muse Spark | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Composer 2 FastNot available | Muse SparkNot available | A complete price comparison is not available. |
| Generation speedtokens per second | Composer 2 FastNot available | Muse SparkNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Composer 2 FastNot available | Muse SparkNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Composer 2 Fast200K | Muse Spark262K | Muse Spark lists the larger context window. |
Benchmark Deep Dive
Agentic8 benchmarks
| Benchmark | Composer 2 Fast | Muse Spark | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | — | 59% | Not comparable |
| τ²-bench resultsSource | — | 91.5% | Not comparable |
| DeepSearchQASource | — | 74.8% | Not comparable |
| CyberGymSource | — | 43.5% | Not comparable |
| Claw-EvalSource | — | 63.8% | Not comparable |
| AA Agentic IndexSource | — | 28.7% | Not comparable |
| GDPval-AASource | — | 32.2% | Not comparable |
| GDPval-AASource | — | 1143 | Not comparable |
Coding7 benchmarks
| Benchmark | Composer 2 Fast | Muse Spark | Result |
|---|---|---|---|
| React Native EvalsSource | 94.9% | — | Not comparable |
| SWE-bench VerifiedSource | — | 77.4% | Not comparable |
| SWE-bench ProSource | — | 52.4% | Not comparable |
| LiveCodeBench ProSource | — | 80.0% | Not comparable |
| Vibe Code BenchSource | — | 19.67% | Not comparable |
| AA Coding IndexSource | — | 58.6% | Not comparable |
| AA-SciCodeSource | — | 51.5% | Not comparable |
Reasoning3 benchmarks
Knowledge11 benchmarks
| Benchmark | Composer 2 Fast | Muse Spark | Result |
|---|---|---|---|
| GPQA-DSource | — | 89.5% | Not comparable |
| HLESource | — | 50.4% | Not comparable |
| HLE w/o toolsSource | — | 42.8% | Not comparable |
| HealthBench HardSource | — | 42.8% | Not comparable |
| MedXpertQA (Text)Source | — | 52.6% | Not comparable |
| Artificial Analysis Intelligence IndexSource | — | 43.1% | Not comparable |
| AA-GPQA DiamondSource | — | 88.4% | Not comparable |
| AA-HLESource | — | 39.9% | Not comparable |
| AA-Omniscience IndexSource | — | 4.1% | Not comparable |
| AA-Omniscience AccuracySource | — | 44.6% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 73.2% | Not comparable |
Math2 benchmarks
Multimodal8 benchmarks
| Benchmark | Composer 2 Fast | Muse Spark | Result |
|---|---|---|---|
| CharXivSource | — | 86.4% | Not comparable |
| MMMU-ProSource | — | 80.4% | Not comparable |
| ERQASource | — | 64.7% | Not comparable |
| SimpleVQASource | — | 71.3% | Not comparable |
| ScreenSpot ProSource | — | 84.1% | Not comparable |
| ZeroBenchSource | — | 33.0% | Not comparable |
| MedXpertQA (MM)Source | — | 78.4% | Not comparable |
| AA-MMMU-ProSource | — | 80.5% | Not comparable |
Inst. Following1 benchmarks
| Benchmark | Composer 2 Fast | Muse Spark | Result |
|---|---|---|---|
| AA-IFBenchSource | — | 75.9% | Not comparable |
Frequently Asked Questions (2)
Can I compare Composer 2 Fast and Muse Spark on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
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Know when it’s worth switching models
The model to choose, the cheaper alternative, and the release we would wait on.
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