Claude Opus 5.5 vs Gemini 3.1 Pro
Claude Opus 5.5 costs $4.00 / $20.00 and Gemini 3.1 Pro costs $2.00 / $12.00 per million input / output tokens. At a typical 3:1 mix, Gemini 3.1 Pro is 1.8× cheaper than Claude Opus 5.5. But Claude Opus 5.5 scores clearly higher on Epoch AI’s Capabilities Index (169 vs 156, beyond the margin of error).
Price
Gemini 3.1 Pro is 1.8× cheaper per token
On a coding agent: $533 vs $853 a month (38% less)
Capability
Claude Opus 5.5 scores higher
Claude Opus 5.5 169 (166–172)
Gemini 3.1 Pro 156 (155–158)
Gemini 3.1 Pro 156 (155–158)
Best value at Claude Opus 5.5’s level
GPT-6.1 Terra, 4× less
Level with or above Claude Opus 5.5 · $213 a month on a coding agent · Every option
Input
$4.00
per 1M
Output
$20.00
per 1M
Cached
$0.20
1M context
Input
$2.00
per 1M
Output
$12.00
per 1M
Cached
$0.20
1M context
Side by side
✓ marks the cheaper price, larger context window, bigger discount or higher score.
| Detail | Claude Opus 5.5 | Gemini 3.1 Pro |
|---|---|---|
| Price per 1M tokens | ||
| Input | $4.00 | $2.00Lowest |
| Output | $20.00 | $12.00Lowest |
| Blended (3 in : 1 out) | $8.00 | $4.50Lowest |
| Cached input | $0.20 | $0.20 |
| Batch or off-peak discount | 50% (batch) | 50% (batch) |
| Long prompts | Same rate at any length | Over 200K: $4 / $18 |
| Limits and model | ||
| Context window | 1M | 1M |
| Capability score Epoch AI index | 169Highest | 156 |
| Arena text score 25 Sep 2026 | 1509Highest | 1487 |
| Released | 22 Sep 2026 | Feb 2026 |
| Open weights | No | No |
| Status | Current | Current |
| Checked | ||
| Price checked | 11 Nov 2026 Anthropic pricing | 6 Nov 2026 Gemini API pricing |
Monthly cost on three workloads
List prices, no batch discount. The cached share applies where a model has a cache rate.
| Workload | Claude Opus 5.5 | Gemini 3.1 Pro | Difference |
|---|---|---|---|
| Customer chat assistant50,000 conversations a month, about 2,000 tokens in and 400 out each; 50% cachedPrice this workload in the calculator | $610 | $350Lower | $260 |
| Document Q&A (RAG)20,000 questions a month over retrieved documents, 12,000 in and 600 out; 30% cachedPrice this workload in the calculator | $926 | $494Lower | $432 |
| Coding agent400 tasks a month, 40 steps each with a growing context; 85% cachedPrice this workload in the calculator | $738 | $449Lower | $289 |
How they differ
- Gemini 3.1 Pro is cheaper on input ($2 vs $4).
- Gemini 3.1 Pro is cheaper on output ($12 vs $20), which matters most for long answers and reasoning models.
- Gemini 3.1 Pro accepts longer prompts (1M vs 1M tokens).
- On Epoch AI’s Capabilities Index, Claude Opus 5.5 scores clearly higher (169 vs 156), beyond the margin of error.
- On the Arena text leaderboard (25 Sep 2026), Claude Opus 5.5 scores higher (1509 vs 1487). Test both on your own prompts before deciding.
Recent changes
All changes- Gemini 4 Argon reached the paid Gemini API at an introductory $2 / $10 per 1M tokens, with cache reads at $0.10, until 30 November 2026; from 1 December it costs $4 / $20.
- ▼ 20%Claude Opus 5.5 launched at $4 / $20 per 1M tokens, 20% below Opus 5.
$5 / $25→ $4 / $20 - Anthropic retired Claude Opus 4.1.
- Anthropic launched Claude Opus 5 at $5 / $25.
- Anthropic retired Claude Opus 4 and Claude Sonnet 4.
Related comparisons
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