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Model comparison

Composer 2 Fast vs Mellum2-12B-A2.5B-Thinking

Data verified

Head-to-head evidence from 0 shared benchmark results across 0 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

No sourced benchmark result is currently shared by both models. This page therefore compares only the available metadata, pricing, and runtime rows; it does not name a quality winner.
N/A
No comparison
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0 category wins0 category wins

Evidence parity. Composer 2 Fast and Mellum2-12B-A2.5B-Thinking share 0 comparable benchmark results. 0 of 8 categories are comparable. 1 result is unique to Composer 2 Fast; 5 to Mellum2-12B-A2.5B-Thinking.

Updated July 23, 2026
Shared results
0
Composer 2 Fast only
1
Mellum2-12B-A2.5B-Thinking only
5
Comparable categories
0 / 8

Benchmark data for Composer 2 Fast and Mellum2-12B-A2.5B-Thinking 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.

Composer 2 Fast has the larger context window at 200K, compared with 128K for Mellum2-12B-A2.5B-Thinking.

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricComposer 2 FastMellum2-12B-A2.5B-ThinkingComparison
Input / output priceUSD per 1M tokensComposer 2 FastNot availableMellum2-12B-A2.5B-ThinkingNot availableA complete price comparison is not available.
Generation speedtokens per secondComposer 2 FastNot availableMellum2-12B-A2.5B-ThinkingNot availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenComposer 2 FastNot availableMellum2-12B-A2.5B-ThinkingNot availableA complete latency comparison is not available.
Context windowmaximum listed tokensComposer 2 Fast200KMellum2-12B-A2.5B-Thinking128KComposer 2 Fast lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkComposer 2 FastMellum2-12B-A2.5B-ThinkingResult
BFCL v4Source —45.6%Not comparable
Coding
BenchmarkComposer 2 FastMellum2-12B-A2.5B-ThinkingResult
React Native EvalsSource 94.9%—Not comparable
Knowledge
BenchmarkComposer 2 FastMellum2-12B-A2.5B-ThinkingResult
MMLU-ReduxSource —86.2%Not comparable
GPQASource —57.6%Not comparable
GPQA-DSource —57.6%Not comparable
Inst. Following
BenchmarkComposer 2 FastMellum2-12B-A2.5B-ThinkingResult
IFEvalSource —76.5%Not comparable
Frequently Asked Questions (2)

Can I compare Composer 2 Fast and Mellum2-12B-A2.5B-Thinking 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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Last updated: July 23, 2026

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