Computer-use model comparison
In eligible head-to-head comparisons, Claude Haiku 4.5 has a 36.8% decisive win rate and Claude Opus 5 has 44.7%. 18.4% end without a decisive preference. These observed rates do not establish which model is best on every task.
These are arena-wide results. Each model encounters a different mix of tasks and opponents. The direct matchup, when available, is reported separately.
| Measure | Claude Haiku 4.5ranked | Claude Opus 5stable |
|---|---|---|
| Leaderboard rankPosition by published rating; a provisional rank can change substantially. | #13 | #5 |
| Win rate · all opponentsDecisive wins / eligible comparisons. Ties stay in the denominator. Opponent mixes differ. | 36.1% | 39.5% |
| CompletionAgent-reported completed runs / non-synthetic arena runs. Completion is not independently verified success. | 64.2% | 70.4% |
| SpeedMedian duration across runs, including unsuccessful runs. Shorter alone does not mean better. |
In eligible head-to-head comparisons, Claude Haiku 4.5 has a 36.8% decisive win rate and Claude Opus 5 has 44.7%. 18.4% end without a decisive preference. These observed rates do not establish which model is best on every task.
No. Completion for Claude Haiku 4.5 and Claude Opus 5 records whether the agent reported finishing. Human preferences, task success and next-action recovery are different measurements.
Read speed and estimated cost alongside completion and human preference. An early failure can be fast. Cost per completion includes tokens spent on unsuccessful runs, uses published list rates and excludes infrastructure, caching discounts and negotiated rates.
Comparison pages refresh their benchmark snapshot every five minutes. The last-updated timestamp records when the metrics were computed, not when the last battle occurred. Model rank may move between snapshots.
| 3.3 min |
| 2.1 min |
| RecoveryFailed actions whose next action did not fail. Recent benchmark window; a proxy for recovery, not task success. | 76.7% | 100.0% |
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| Estimated cost / completionInference tokens from all runs / completed runs, using list rates dated 2026-09-06. Excludes infrastructure and discounts. | $1.01 | $1.73 |
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| Published ratingBradley–Terry when publishable; online Elo fallback for provisional models. ± is the published uncertainty interval. | 982 ± 28 | 1031 ± 25 |
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