Claude Sonnet 4.6 vs Gemini 3.1 Pro
Claude Sonnet 4.6 (2026) and Gemini 3.1 Pro (2026) are frontier reasoning models from Anthropic and Google DeepMind. Claude Sonnet 4.6 ships a 1M-token context window, while Gemini 3.1 Pro ships a 1M-token context window. On SWE-bench Verified, Gemini 3.1 Pro leads by 1 pts. On pricing, Gemini 3.1 Pro costs $1.25/1M input tokens versus $3/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Gemini 3.1 Pro is ~140% cheaper at $1.25/1M; pay for Claude Sonnet 4.6 only for coding workflow support.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-02-17 | 2026-02-19 |
| Context window | 1M | 1M |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2025-12 | 2025-01 |
Pricing and availability
| Pricing attribute | Claude Sonnet 4.6 | Gemini 3.1 Pro |
|---|---|---|
| Input price | $3/1M tokens | $1.25/1M tokens |
| Output price | $15/1M tokens | $10/1M tokens |
| Providers |
Capabilities
| Capability | Claude Sonnet 4.6 | Gemini 3.1 Pro |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | No |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | No |
| Code execution | Yes | Yes |
Benchmarks
| Benchmark | Claude Sonnet 4.6 | Gemini 3.1 Pro |
|---|---|---|
| SWE-bench Verified | 79.6 | 80.6 |
| Google-Proof Q&A | 89.9 | 94.3 |
| Chatbot Arena | 1459.0 | 1493.0 |
| MultiChallenge | 57.1 | 71.4 |
| τ-bench | 87.5 | 76.5 |
Deep dive
On shared benchmark coverage, SWE-bench Verified has Claude Sonnet 4.6 at 79.6 and Gemini 3.1 Pro at 80.6, with Gemini 3.1 Pro ahead by 1 points; Google-Proof Q&A has Claude Sonnet 4.6 at 89.9 and Gemini 3.1 Pro at 94.3, with Gemini 3.1 Pro ahead by 4.4 points; Chatbot Arena has Claude Sonnet 4.6 at 1459 and Gemini 3.1 Pro at 1493, with Gemini 3.1 Pro ahead by 34 points. The largest visible gap is 34 points on Chatbot Arena, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on reasoning mode: Claude Sonnet 4.6 and structured outputs: Claude Sonnet 4.6. Both models share vision, multimodal input, function calling, and tool use, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Claude Sonnet 4.6 lists $3/1M input and $15/1M output tokens, while Gemini 3.1 Pro lists $1.25/1M input and $10/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Gemini 3.1 Pro lower by about $2.72 per million blended tokens. Availability is 4 providers versus 2, so concentration risk also matters.
Choose Claude Sonnet 4.6 when coding workflow support and broader provider choice are central to the workload. Choose Gemini 3.1 Pro when coding workflow support and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, Claude Sonnet 4.6 or Gemini 3.1 Pro?
Claude Sonnet 4.6 supports 1M tokens, while Gemini 3.1 Pro supports 1M tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Claude Sonnet 4.6 or Gemini 3.1 Pro?
Gemini 3.1 Pro is cheaper on tracked token pricing. Claude Sonnet 4.6 costs $3/1M input and $15/1M output tokens. Gemini 3.1 Pro costs $1.25/1M input and $10/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude Sonnet 4.6 or Gemini 3.1 Pro open source?
Claude Sonnet 4.6 is listed under Proprietary. Gemini 3.1 Pro is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Claude Sonnet 4.6 or Gemini 3.1 Pro?
Both Claude Sonnet 4.6 and Gemini 3.1 Pro expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for multimodal input, Claude Sonnet 4.6 or Gemini 3.1 Pro?
Both Claude Sonnet 4.6 and Gemini 3.1 Pro expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run Claude Sonnet 4.6 and Gemini 3.1 Pro?
Claude Sonnet 4.6 is available on OpenRouter, Anthropic, AWS Bedrock, and GCP Vertex AI. Gemini 3.1 Pro is available on Google AI Studio and Replicate API. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-05-11. Data sourced from public model cards and provider documentation.