Model comparison · Updated May 2026
Claude Sonnet 4.6 vs Gemini 2.5 Pro: Price, Context, Benchmarks (2026)
A direct, dated comparison of Claude Sonnet 4.6 (Anthropic) and Gemini 2.5 Pro (Google). Every number below is sourced from official provider docs and public benchmarks. If you need to make this decision today, the verdict is at the top.
30-second verdict
- Cheaper: Gemini 2.5 Pro (input $1.25 vs $3.00 per 1M tokens).
- Longer context: Gemini 2.5 Pro at 2M vs 1M.
- Stronger on SWE-bench Verified: Claude Sonnet 4.6 (~70% vs ~60%).
- Higher LMArena: Claude Sonnet 4.6 (1438 vs 1420).
Specs side-by-side
| Spec | Claude Sonnet 4.6 | Gemini 2.5 Pro |
|---|---|---|
| Vendor | Anthropic | |
| Input price (per 1M tokens) | $3.00 | $1.25 |
| Output price | $15.00 | $10.00 |
| Context window | 1M | 2M |
| Release date | 2026-03-12 | 2025-06-17 |
| SWE-bench Verified | ~70% | ~60% |
| HumanEval | ~94% | ~92% |
| LMArena (approx) | 1438 | 1420 |
| Open weights | No | No |
| Capabilities | reasoning, code, vision | reasoning, code, vision |
Pricing from official Anthropic and Google docs. Benchmark numbers from SWE-bench Verified, HumanEval, and LMArena public leaderboards as of May 2026.
Claude Sonnet 4.6 — strengths and weaknesses
Strengths. Best agentic coding, restrained edits, strong tool calling, default in Cursor / Cline / Aider.
Weaknesses. Pricier than DeepSeek; slower than Haiku tier.
Best for. Agentic coding, multi-file refactors, structured output, Cursor power-users.
Gemini 2.5 Pro — strengths and weaknesses
Strengths. Largest context window (2M), strong multimodal, generous AI Studio free tier.
Weaknesses. Recall drops past 500K, weaker on agentic edits than Claude / GPT.
Best for. Whole-repo Q&A, long PDFs, multimodal, free prototyping.
Which one should you pick?
Pick Claude Sonnet 4.6 if: agentic coding, multi-file refactors, structured output, cursor power-users.
Pick Gemini 2.5 Pro if: whole-repo q&a, long pdfs, multimodal, free prototyping.
Use both if: you're building an agent or content pipeline. Route the high-stakes / hard-reasoning calls to whichever scores higher on the axis you care about, and the bulk / cheap calls to the other. Most production AI products run a 2-3 model router rather than betting on one.
Try them side-by-side
The Check.AI comparison tool lets you put both models in one table with all the numbers, switch capability filters, and share the resulting URL with your team.
→ Compare Claude Sonnet 4.6 and Gemini 2.5 Pro in the live tool