Claude 3.5 Sonnet (upgraded) vs Gemini 3.1 Flash
Anthropic Claude 3.5 Sonnet (upgraded) | Google Gemini 3.1 Flash | |
|---|---|---|
| Overview | ||
| Company | Anthropic | |
| Release date | Oct 22 2024 | Feb 26 2026 |
| Access | Proprietary | Proprietary |
| Benchmarks | ||
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. | 49% | — |
| Timeline | ||
| Release gap | Claude 3.5 Sonnet (upgraded) shipped 492 days before Gemini 3.1 Flash | |
Which is better: Claude 3.5 Sonnet (upgraded) or Gemini 3.1 Flash?
Claude 3.5 Sonnet (upgraded) and Gemini 3.1 Flash don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 3.5 Sonnet (upgraded) shipped 492 days before Gemini 3.1 Flash, 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 3.5 Sonnet (upgraded) and Gemini 3.1 Flash don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude 3.5 Sonnet (upgraded) was released by Anthropic on Oct 22 2024.
Gemini 3.1 Flash was released by Google on Feb 26 2026.
Other comparisons
Claude 3.5 Sonnet (upgraded) vs GPT-5.6 SolGemini 3.1 Flash vs GPT-5.6 SolClaude 3.5 Sonnet (upgraded) vs Muse Spark 1.1Gemini 3.1 Flash vs Muse Spark 1.1Claude 3.5 Sonnet (upgraded) vs Grok 4.5Gemini 3.1 Flash vs Grok 4.5Claude 3.5 Sonnet (upgraded) vs DeepSeek-V4-ProGemini 3.1 Flash vs DeepSeek-V4-ProClaude 3.5 Sonnet (upgraded) vs Mistral Medium 3.5Gemini 3.1 Flash vs Mistral Medium 3.5Claude 3.5 Sonnet (upgraded) vs Kimi K2.7 CodeGemini 3.1 Flash vs Kimi K2.7 Code