token.app › Compare › Gemini 3.5 Flash vs Claude Opus 5
Gemini 3.5 Flash vs Claude Opus 5
Claude Opus 5 leads on 4 of 5 shared benchmarks. Gemini 3.5 Flash is 3.0× cheaper per token on a blended 3:1 basis. Gemini 3.5 Flash accepts the larger context window (1.0M).
Head to head
Blended price uses a 3:1 input:output mix
| Gemini 3.5 Flash | Claude Opus 5 | |
|---|---|---|
| Provider | Anthropic | |
| Input $/1M | $1.50 | $5.00 |
| Output $/1M | $9.00 | $25.00 |
| Blended $/1M | $3.38 | $10.00 |
| Context window | 1.0M | 1M |
| Max output | 66K | 128K |
| Released | May 2026 | Jul 2026 |
| Licence | Proprietary | Proprietary |
| GPQA Diamond | 92.8% | 93.9% |
| FrontierMath T1–3 | 62.8% | 85.6% |
| FrontierMath T4 | 26.8% | 73.2% |
| SimpleQA Verified | 68.4% | 56.7% |
| OTIS Mock AIME | 95.6% | 98.9% |
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose Gemini 3.5 Flash if…
- Costs less per token — $3.38 vs $10.00 blended
- Higher SimpleQA Verified (68.4% vs 56.7%)
- Larger context window (1.0M)
Choose Claude Opus 5 if…
- Higher GPQA Diamond (93.9% vs 92.8%)
- Higher FrontierMath T1–3 (85.6% vs 62.8%)
- Higher FrontierMath T4 (73.2% vs 26.8%)
- Higher OTIS Mock AIME (98.9% vs 95.6%)
- Newer model (released Jul 2026)
FAQ
Which is better, Gemini 3.5 Flash or Claude Opus 5?
Across the 5 benchmarks both models have independently-run scores for, Gemini 3.5 Flash leads on 1 and Claude Opus 5 leads on 4. Benchmarks are one input — price and context window are on this page too.
Is Gemini 3.5 Flash cheaper than Claude Opus 5?
Gemini 3.5 Flash is cheaper: $3.38 versus $10.00 per million tokens blended at 3:1 input:output. Input alone: $1.50 vs $5.00. Output alone: $9.00 vs $25.00.
What context windows do Gemini 3.5 Flash and Claude Opus 5 have?
Gemini 3.5 Flash: 1,048,576 tokens. Claude Opus 5: 1,000,000 tokens.
Who makes Gemini 3.5 Flash and Claude Opus 5?
Gemini 3.5 Flash is made by Google. Claude Opus 5 is made by Anthropic.
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