Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.
Claude Haiku 4.5 and Composer 2 finish on the same overall score, so this is less about a single winner and more about where the edge shows up. The headline says tie; the benchmark table is where the real choice happens.
Claude Haiku 4.5 is also the more expensive model on tokens at $0.80 input / $4.00 output per 1M tokens, versus $0.50 input / $2.50 output per 1M tokens for Composer 2. Composer 2 is the reasoning model in the pair, while Claude Haiku 4.5 is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use.
Treat this as a split decision. Claude Haiku 4.5 makes more sense if you would rather avoid the extra latency and token burn of a reasoning model; Composer 2 is the better fit if agentic is the priority or you want the cheaper token bill.
Claude Haiku 4.5
51.9
Composer 2
61.7
Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.
Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.
Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.
Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.
Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.
Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.
Comparable scores for this category are coming soon. One or both models do not have sourced results here yet.
Claude Haiku 4.5 and Composer 2 are tied on overall score, so the right pick depends on which category matters most for your use case.
Composer 2 has the edge for agentic tasks in this comparison, averaging 61.7 versus 51.9. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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