Claude Sonnet 4.6 vs Gemini 2.5 Flash
Pricing, benchmarks, and use case comparison
Quick take
- •Claude Sonnet 4.6 is meaningfully stronger at coding (85 vs 75 on our capability index).
- •Gemini 2.5 Flash is 90% cheaper on input tokens, which compounds fast on high-volume or agentic workloads.
- •Claude Sonnet 4.6 has a 1M context window vs 1,048,576 tokens (1M) input; up to 65,535 output - better for whole-repo or long-document work.
Specs comparison
| Claude Sonnet 4.6 | Gemini 2.5 Flash | |
|---|---|---|
| Provider | Anthropic | Google DeepMind |
| Type | Closed source | Closed source |
| Context window | ✓1M | 1,048,576 tokens (1M) input; up to 65,535 output |
| Input / 1M tokens | $3.00 | ✓$0.30 |
| Output / 1M tokens | $15.00 | $2.50 |
| Release date | 2026-02 | 2025-06 |
Benchmarks
| Benchmark | Claude Sonnet 4.6 | Gemini 2.5 Flash |
|---|---|---|
| SWE-bench Verified | 79.6% | - |
| Terminal-Bench 2.0 | 59.1% | - |
| OSWorld-Verified | 72.5% | - |
| GPQA | 79.7% | - |
| Context window | - | 1M tokens |
| Input price | - | $0.30/1M |
Scores sourced from official provider release posts and independent benchmark aggregators.
Which should you choose?
Choose Claude Sonnet 4.6 if...
- →You have an existing integration pinned to Sonnet 4.6 and want stability
- →You need a proven mid-tier model with 1M context at $3/$15
- →You want predictable behavior without the new-tokenizer/thinking changes in Sonnet 5
- →You are cost-sensitive and don't need Sonnet 5's incremental gains
Choose Gemini 2.5 Flash if...
- →High-volume, latency-sensitive production workloads
- →Chatbots, extraction, classification, and summarization at scale
- →You need decent reasoning but must control costs