Claude Sonnet 5 vs Gemini 3.6 Flash
Claude Sonnet 5 and Gemini 3.6 Flash compete for the production default slot. Sonnet leads the Intelligence Index 55 to 52 at a higher price — $2/$10 versus $1.50/$7.50 per million tokens; Flash reads audio and video, and serves at 235 tokens per second, over three times Sonnet's speed. Task type decides the winner.
Side by side
| Claude Sonnet 5 | Gemini 3.6 Flash | |
|---|---|---|
| Maker | Anthropic | |
| Released | 2026-06-30 | 2026-07-21 |
| Context window | 1M tokens | 1M tokens |
| Modalities in | text, image | text, image, audio, video |
| Input $/MTok | $2 | $1.5 |
| Output $/MTok | $10 | $7.5 |
| Open weights | No | No |
Benchmark deltas
| Benchmark | Claude Sonnet 5 | Gemini 3.6 Flash | Δ |
|---|---|---|---|
| AA Intelligence Index | 55 | 52 | +3 |
Δ is Claude Sonnet 5 minus Gemini 3.6 Flash, in points. Shaded cell wins the row. Dashed values are vendor-published, not yet reproduced — methodology.
Cost calculator
- Claude Sonnet 5
- $200/mo
- Gemini 3.6 Flash
- $150/mo
- Difference
- $50/mo
List prices as of 2026-08-11; excludes caching, batch, and long-context tiers — see model pages for tier notes.
Verdict
Sonnet 5 buys three measured points of intelligence for roughly 30% more per token; Flash buys speed and senses. The split writes itself: reasoning-heavy text pipelines, coding assistance, and agent workloads lean Sonnet; media-rich, latency-sensitive, high-volume products lean Flash — its multimodal input and throughput are unmatched at this price. Teams running both patterns increasingly route by task rather than standardizing, and this pairing is the most common routing boundary we see cited.
Verdicts are analysis, not measurement, and are labeled as such per our editorial policy.
FAQ
- Is Claude Sonnet 5 cheaper than Gemini 3.6 Flash?
- No. Gemini 3.6 Flash is cheaper: $1.5 input / $7.5 output per million tokens against $2 / $10 for Claude Sonnet 5 (prices as of August 11, 2026).
- Which has the longer context window — Claude Sonnet 5 or Gemini 3.6 Flash?
- They match: both accept 1M tokens of context.
- Which is the more capable model, Claude Sonnet 5 or Gemini 3.6 Flash?
- Claude Sonnet 5 scores higher on the Artificial Analysis Intelligence Index: 55 (measured August 11, 2026) against 52 for Gemini 3.6 Flash (measured August 11, 2026).
Comparison published August 11, 2026; underlying data last changed August 11, 2026.