Claude Fable 5.1 vs Gemini 3.1 Pro Preview: API cost
Standard, cached and batch API prices for Claude Fable 5.1 (Anthropic) and Gemini 3.1 Pro Preview (Google), and what each costs for your usage.
Gemini 3.1 Pro Preview is cheaper than Claude Fable 5.1 at standard rates, with 5× cheaper input and 4.2× cheaper output.
- Input $300.00
- Cached input $7.50
- Output $450.00
- Input $60.00
- Cached input $6.00
- Output $108.00
Show as a table
| Output tokens | Claude Fable 5.1 | Gemini 3.1 Pro Preview |
|---|---|---|
| 0 | $10.00 | $2.00 |
| 250 | $22.50 | $5.00 |
| 500 | $35.00 | $8.00 |
| 750 | $47.50 | $11.00 |
| 1,000 | $60.00 | $14.00 |
| Token type | Claude Fable 5.1 | Gemini 3.1 Pro Preview | |
|---|---|---|---|
| Input | $10 | $2 | Gemini 3.1 Pro Preview is 5× cheaper |
| Cached input | $0.25 | $0.20 | Gemini 3.1 Pro Preview is 20% cheaper |
| Output | $50 | $12 | Gemini 3.1 Pro Preview is 4.2× cheaper |
| Batch input | $5 | $1 | Gemini 3.1 Pro Preview is 5× cheaper |
| Batch cached input | $0.125 | $0.20 | Claude Fable 5.1 is 38% cheaper |
| Batch output | $25 | $6 | Gemini 3.1 Pro Preview is 4.2× cheaper |
Gemini 3.1 Pro Preview: Prompts over 200K tokens are billed at a higher rate.
| Workload | Claude Fable 5.1 | Gemini 3.1 Pro Preview |
|---|---|---|
Support chatbot 2,000 in / 300 out tokens,
1,000 requests a day, 50% cached | $757.50 | $174.00 |
Document summaries 10,000 in / 800 out tokens,
200 requests a day | $840.00 | $177.60 |
Tagging / classifying 400 in / 20 out tokens,
20,000 requests a day | $3,000 | $624.00 |
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Or see Claude Fable 5.1 pricing, Gemini 3.1 Pro Preview pricing, or compare any two models.
FAQ
Frequently asked questions
Is Claude Fable 5.1 cheaper than Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview is cheaper than Claude Fable 5.1 at standard rates, with 5× cheaper input and 4.2× cheaper output. Based on standard API rates last checked on 30 Sept 2026.
How much do Claude Fable 5.1 and Gemini 3.1 Pro Preview cost per million tokens?
Claude Fable 5.1: $10 per million input tokens and $50 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 Fable 5.1’s batch rates are $5 input and $25 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 Fable 5.1 charges $0.25 per million cached input tokens, against $10 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.