Claude Opus 4.5 vs Gemini 1.5 Flash
Anthropic Claude Opus 4.5 | Google Gemini 1.5 Flash | |
|---|---|---|
| Overview | ||
| Company | Anthropic | |
| Release date | Nov 24 2025 | May 14 2024 |
| Access | Proprietary | Proprietary |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 90% | — |
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 80.9% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 87% | — |
| Timeline | ||
| Release gap | Gemini 1.5 Flash shipped 559 days before Claude Opus 4.5 | |
Which is better: Claude Opus 4.5 or Gemini 1.5 Flash?
Claude Opus 4.5 and Gemini 1.5 Flash don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Gemini 1.5 Flash shipped 559 days before Claude Opus 4.5, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
Direct benchmark comparisons are unavailable — Claude Opus 4.5 and Gemini 1.5 Flash don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude Opus 4.5 was released by Anthropic on Nov 24 2025.
Gemini 1.5 Flash was released by Google on May 14 2024.
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