Compare / head-to-head
Claude Sonnet 5vsGemini 3.5 Flash
Gemini 3.5 Flash leads 3 of 5 shared benchmarks. Gemini 3.5 Flash is 1.1x cheaper per token. Gemini 3.5 Flash has the larger context window (1.0M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
2 – 3
Gemini 3.5 Flash leads
Cheaper per token
Gemini 3.5 Flash
1.1x cheaper, input + output
Larger context
Gemini 3.5 Flash
1.0M tokens
Provider uptime (30d)
100% · 100%
Anthropic · Google
Claude Sonnet 5
Anthropic · released 2026-06-30
textvision
Gemini 3.5 Flash
Google · released 2026-05-19
textvisionaudio
Quality
Benchmark matrix
5 shared · 3 only Claude Sonnet 5 · 10 only Gemini 3.5 Flash| Benchmark | Claude Sonnet 5 | Gemini 3.5 Flash | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 90.5% ↗epoch | 92.8% ↗epoch | -2.3 pt | Gemini 3.5 Flash |
| FrontierMath Tier 4 v2 (Epoch AI run) | 29.3% ↗epoch | 26.8% ↗epoch | +2.5 pt | Claude Sonnet 5 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 65.6% ↗epoch | 62.8% ↗epoch | +2.8 pt | Claude Sonnet 5 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 94.7% ↗epoch | 95.6% ↗epoch | -0.9 pt | Gemini 3.5 Flash |
| SimpleQA Verified | 33.7% ↗epoch | 66.2% ↗epoch | -32.5 pt | Gemini 3.5 Flash |
| Only Claude Sonnet 5 reports · 3 | ||||
| SWE-bench Verified | 85.2% ↗ | not reported | — | — |
| Humanity's Last Exam (no tools) | 43.2% ↗ | not reported | — | — |
| Humanity's Last Exam (with tools) | 57.4% ↗ | not reported | — | — |
| Only Gemini 3.5 Flash reports · 10 | ||||
| AIME 2026 | not reported | 95% ↗matharena ⚠ | — | — |
| ARC-AGI-2 | not reported | 72.1% ↗ | — | — |
| GDPVal-AA | not reported | 1656 ↗ | — | — |
| Humanity's Last Exam (full set, text + MM) | not reported | 40.2% ↗ | — | — |
| MCP Atlas | not reported | 83.6% ↗ | — | — |
| MMMU-Pro | not reported | 83.6% ↗ | — | — |
| OSWorld-Verified | not reported | 78.4% ↗ | — | — |
| SWE-Bench Pro (Public) | not reported | 55.1% ↗ | — | — |
| SWE-bench Verified (Epoch AI run) | not reported | 79.3% ↗epoch | — | — |
| Terminal-bench 2.1 | not reported | 76.2% ↗ | — | — |
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is Claude Sonnet 5 minus Gemini 3.5 Flash in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | Claude Sonnet 5 | Gemini 3.5 Flash | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1.0M tokens | Gemini 3.5 Flash |
| Max output | 128K tokens | 66K tokens | Claude Sonnet 5 |
| Input price / 1M | $2 ↗ | $1.5 ↗ | Gemini 3.5 Flash |
| Output price / 1M | $10 ↗ | $9 ↗ | Gemini 3.5 Flash |
| Cached input / 1M | $0.2 ↗ | $0.15 ↗ | Gemini 3.5 Flash |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $12 | $10.5 | Gemini 3.5 Flash |
| Modalities | text · vision | text · vision · audio | Gemini 3.5 Flash |
| Released | 2026-06-30 | 2026-05-19 | — |
| Cited benchmark scores | 8 | 15 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Claude Sonnet 5 vs …
Models sharing the most benchmarksMore matchups
Gemini 3.5 Flash vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Claude Sonnet 5 and Gemini 3.5 Flash on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.