Model comparison
Claude Haiku 4.5 vs Composer 2 Fast
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: Claude Haiku 4.5 #82 (Estimated); Composer 2 Fast unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Haiku 4.5 and Composer 2 Fast share 0 comparable benchmark results. 0 of 8 categories are comparable. 6 results are unique to Claude Haiku 4.5; 1 to Composer 2 Fast.
Updated July 28, 2026- Shared results
- 0
- Claude Haiku 4.5 only
- 6
- Composer 2 Fast only
- 1
- Comparable categories
- 0 / 8
Benchmark data for Claude Haiku 4.5 and Composer 2 Fast 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.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude Haiku 4.5 | Composer 2 Fast | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Haiku 4.5$1 input / $5 output | Composer 2 FastNot available | A complete price comparison is not available. |
| Generation speedtokens per second | Claude Haiku 4.5Not available | Composer 2 FastNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Haiku 4.5Not available | Composer 2 FastNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Haiku 4.5200K | Composer 2 Fast200K | Listed context windows are equal. |
Benchmark Deep Dive
Frequently Asked Questions (3)
Can I compare Claude Haiku 4.5 and Composer 2 Fast 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.
What data is available for Claude Haiku 4.5 and Composer 2 Fast today?
Claude Haiku 4.5: $1.00 input / $5.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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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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