Claude Opus 5.5 vs Gemini 2.5 Flash
Price, context window & benchmark comparison
VS
Compare different models
Verdict: Gemini 2.5 Flash is 9.4× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix. Gemini 2.5 Flash has the larger context window (1M vs 1M).
| Claude Opus 5.5 | Gemini 2.5 Flash | |
|---|---|---|
| Input price / 1M | $4.00 | $0.30 |
| Output price / 1M | $20.00 | $2.50 |
| Blended price (3:1) | $8.00 | $0.85 |
| Cached input / 1M | $0.20 | $0.03 |
| Context window | 1M | 1M |
| Max output | 128K | 66K |
| Intelligence index | 57.6 | — |
| Coding index | — | — |
| Providers | 11 | — |
| Best provider uptime (30m) | 100.0% | — |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-09-22 | 2025-06-17 |
| Retirement | — | 2026-10-20 |
Cost calculator
FAQ
Which is cheaper, Claude Opus 5.5 or Gemini 2.5 Flash?
Gemini 2.5 Flash is 9.4× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix.
Claude Opus 5.5 vs Gemini 2.5 Flash: which has a bigger context window?
Claude Opus 5.5: 1,000,000 tokens. Gemini 2.5 Flash: 1,048,576 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: Claude Opus 5.5 ≈ $18,000, Gemini 2.5 Flash ≈ $1,850.
More comparisons
Claude Opus 5.5 vs GLM 5.3 PrimeClaude Opus 5.5 vs Qwen3.8 Max PrimeClaude Opus 5.5 vs Command A+Claude Opus 5.5 vs GPT-6 Luna ProClaude Opus 5.5 vs GPT-6 LunaClaude Opus 5.5 vs GPT-6 Sol ProClaude Opus 5.5 vs GPT-6 SolClaude Opus 5.5 vs MiMo-V2.6-Pro-UltraSpeedClaude Opus 5.5 vs MiMo-V2.6-FlashClaude Opus 5.5 vs Grok 4.7Claude Opus 5.5 vs Qwen3.8 Omni FlashClaude Opus 5.5 vs GLM 5.3 FlashXClaude Opus 5.5 vs DeepSeek V4.1 FlashClaude Opus 5.5 vs GPT-6 AstraClaude Opus 5.5 vs GPT-6 Astra ProClaude Opus 5.5 vs Qwen3.8 Max (0902)Gemini 2.5 Flash vs GLM 5.3 PrimeGemini 2.5 Flash vs Qwen3.8 Max PrimeGemini 2.5 Flash vs Command A+Gemini 2.5 Flash vs GPT-6 Luna ProGemini 2.5 Flash vs GPT-6 LunaGemini 2.5 Flash vs GPT-6 Sol ProGemini 2.5 Flash vs GPT-6 SolGemini 2.5 Flash vs MiMo-V2.6-Pro-UltraSpeed