Claude Opus 5.5 vs Gemini 3.1 Pro Preview: API cost
Standard, cached and batch API prices for Claude Opus 5.5 (Anthropic) and Gemini 3.1 Pro Preview (Google), and what each costs for your usage.
Gemini 3.1 Pro Preview is cheaper than Claude Opus 5.5 at standard rates, with 2× cheaper input and 40% cheaper output.
- Input $120.00
- Cached input $6.00
- Output $180.00
- Input $60.00
- Cached input $6.00
- Output $108.00
Show as a table
| Output tokens | Claude Opus 5.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| 0 | $4.00 | $2.00 |
| 250 | $9.00 | $5.00 |
| 500 | $14.00 | $8.00 |
| 750 | $19.00 | $11.00 |
| 1,000 | $24.00 | $14.00 |
| Token type | Claude Opus 5.5 | Gemini 3.1 Pro Preview | |
|---|---|---|---|
| Input | $4 | $2 | Gemini 3.1 Pro Preview is 2× cheaper |
| Cached input | $0.20 | $0.20 | Same price |
| Output | $20 | $12 | Gemini 3.1 Pro Preview is 40% cheaper |
| Batch input | $2 | $1 | Gemini 3.1 Pro Preview is 2× cheaper |
| Batch cached input | $0.10 | $0.20 | Claude Opus 5.5 is 2× cheaper |
| Batch output | $10 | $6 | Gemini 3.1 Pro Preview is 40% cheaper |
Gemini 3.1 Pro Preview: Prompts over 200K tokens are billed at a higher rate.
| Workload | Claude Opus 5.5 | Gemini 3.1 Pro Preview |
|---|---|---|
Support chatbot 2,000 in / 300 out tokens,
1,000 requests a day, 50% cached | $306.00 | $174.00 |
Document summaries 10,000 in / 800 out tokens,
200 requests a day | $336.00 | $177.60 |
Tagging / classifying 400 in / 20 out tokens,
20,000 requests a day | $1,200 | $624.00 |
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Or see Claude Opus 5.5 pricing, Gemini 3.1 Pro Preview pricing, or compare any two models.
FAQ
Frequently asked questions
Is Claude Opus 5.5 cheaper than Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview is cheaper than Claude Opus 5.5 at standard rates, with 2× cheaper input and 40% cheaper output. Based on standard API rates last checked on 30 Sept 2026.
How much do Claude Opus 5.5 and Gemini 3.1 Pro Preview cost per million tokens?
Claude Opus 5.5: $4 per million input tokens and $20 per million output tokens. Gemini 3.1 Pro Preview: $2 input and $12 output. These are standard rates in USD, before tax, from each provider’s own pricing page.
Which is cheaper with the Batch API?
Claude Opus 5.5’s batch rates are $2 input and $10 output per million tokens (50% off); Gemini 3.1 Pro Preview’s batch rates are $1 input and $6 output per million tokens (50% off).
Does prompt caching change the comparison?
Claude Opus 5.5 charges $0.20 per million cached input tokens, against $4 for normal input; Gemini 3.1 Pro Preview charges $0.20 per million cached input tokens, against $2 for normal input. Cache write and storage charges are extra and aren’t included here.