Claude Sonnet 5 vs Gemini 3.1 Pro
Claude Sonnet 5 and Gemini 3.1 Pro are both current production-tier models. Claude Sonnet 5 leads on tool use. Gemini 3.1 Pro leads on long-context retrieval, multilingual, vision.
Specs side by side
| Metric | Anthropic Claude Sonnet 5 | Google Gemini 3.1 Pro |
|---|---|---|
| Input price (per 1M) | $3 | $2 |
| Output price (per 1M) | $15 | $12 |
| Context window | 1M tokens | 2M tokens |
| Speed tier | balanced | balanced |
| Open weights | No | No |
| EU region | Yes | Yes |
| Free tier | No | No |
| Prompt caching | Yes | Yes |
| Vision input | Yes | Yes |
| Extended thinking | Yes | Yes |
When to choose each
Choose Claude Sonnet 5 if…
- Tool use is central to your workload
Choose Gemini 3.1 Pro if…
- You need 2M context (2× more than Claude Sonnet 5)
- Long-context retrieval is central to your workload
- Multilingual is central to your workload
Benchmark delta
Claude Sonnet 5 leads on
- Tool use
Gemini 3.1 Pro leads on
- Long-context retrieval
- Multilingual
- Vision
FAQ — Claude Sonnet 5 vs Gemini 3.1 Pro
Claude Sonnet 5 vs Gemini 3.1 Pro — which is better?
Claude Sonnet 5 and Gemini 3.1 Pro are both current production-tier models. Claude Sonnet 5 leads on tool use. Gemini 3.1 Pro leads on long-context retrieval, multilingual, vision. The right pick depends on your use case — see "When to choose each" above for a data-driven decision.
How does Claude Sonnet 5 pricing compare to Gemini 3.1 Pro?
Claude Sonnet 5 costs $3 / $15 per 1M vs Gemini 3.1 Pro at $2 / $12 per 1M. Gemini 3.1 Pro is cheaper on output tokens by roughly 25%. Both support prompt caching, which reduces effective cost by 80-90% on repeat system prompts.
Does Claude Sonnet 5 or Gemini 3.1 Pro have the bigger context window?
Gemini 3.1 Pro has a 2M-token context window — 2× the 1M context of Claude Sonnet 5. Enough for entire codebases, books, or multi-document RAG.
Is there a free tier for Claude Sonnet 5 or Gemini 3.1 Pro?
Claude Sonnet 5: no — Default model on Claude.ai Free/Pro web chat; API requires paid credits. Gemini 3.1 Pro: no — Paid-only since 2026-04-01 (previously had free tier via AI Studio).
Which is better for coding — Claude Sonnet 5 or Gemini 3.1 Pro?
Claude Sonnet 5 leads on coding benchmarks (Claude Sonnet 5: 95/100, Gemini 3.1 Pro: 94/100). For production coding agents also weigh tool-use performance — Claude Sonnet 5 scores 96, Gemini 3.1 Pro scores 91.