Claude Sonnet 5 vs Gemini 3.5 Flash
Claude Sonnet 5 and Gemini 3.5 Flash are both current production-tier models. Gemini 3.5 Flash is meaningfully cheaper at $1.5 / $9 per 1M. Claude Sonnet 5 leads on coding, tool use.
Specs side by side
| Metric | Anthropic Claude Sonnet 5 | Google Gemini 3.5 Flash |
|---|---|---|
| Input price (per 1M) | $3 | $1.5 |
| Output price (per 1M) | $15 | $9 |
| Context window | 1M tokens | 1.0M tokens |
| Speed tier | balanced | fast |
| Open weights | No | No |
| EU region | Yes | Yes |
| Free tier | No | Google AI Studio |
| Prompt caching | Yes | Yes |
| Vision input | Yes | Yes |
| Extended thinking | Yes | Yes |
When to choose each
Choose Claude Sonnet 5 if…
- Coding is central to your workload
- Tool use is central to your workload
Choose Gemini 3.5 Flash if…
- You want a free tier for prototyping
Benchmark delta
Claude Sonnet 5 leads on
- Coding
- Tool use
Gemini 3.5 Flash leads on
Gemini 3.5 Flash has no meaningful benchmark lead in this pair.
FAQ — Claude Sonnet 5 vs Gemini 3.5 Flash
Claude Sonnet 5 vs Gemini 3.5 Flash — which is better?
Claude Sonnet 5 and Gemini 3.5 Flash are both current production-tier models. Gemini 3.5 Flash is meaningfully cheaper at $1.5 / $9 per 1M. Claude Sonnet 5 leads on coding, tool use. 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 3.5 Flash?
Claude Sonnet 5 costs $3 / $15 per 1M vs Gemini 3.5 Flash at $1.5 / $9 per 1M. Gemini 3.5 Flash is cheaper on output tokens by roughly 67%. Both support prompt caching, which reduces effective cost by 80-90% on repeat system prompts.
Does Claude Sonnet 5 or Gemini 3.5 Flash have the bigger context window?
Gemini 3.5 Flash has a 1.0M-token context window — 1× 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 3.5 Flash?
Claude Sonnet 5: no — Default model on Claude.ai Free/Pro web chat; API requires paid credits. Gemini 3.5 Flash: yes — Reduced daily quota via AI Studio for prototyping.
Which is better for coding — Claude Sonnet 5 or Gemini 3.5 Flash?
Claude Sonnet 5 leads on coding benchmarks (Claude Sonnet 5: 95/100, Gemini 3.5 Flash: 91/100). For production coding agents also weigh tool-use performance — Claude Sonnet 5 scores 96, Gemini 3.5 Flash scores 90.