Claude Sonnet 4.5 → Gemini 3.1 Pro: cost per request on six tasks
Gemini 3.1 Pro costs 22–33% less than Claude Sonnet 4.5 per request on six common tasks. It costs no more per result that works if its results work first time at least 68% as often as Claude Sonnet 4.5's on search re-ranking, and 78% as often on translation. Anthropic has announced Claude Sonnet 4.5's API shutdown for 2026-11-30.
List prices per million tokens
| Model | Input | Cached input | Output |
|---|---|---|---|
| Claude Sonnet 4.5 | $3.00 | $0.30 | $15.00 |
| Gemini 3.1 Pro | $2.00 | $0.20 | $12.00 |
Prices checked 2026-11-12.
Cost per 1,000 requests
| Task | Claude Sonnet 4.5 | Gemini 3.1 Pro | Change | Cheaper per result that works if it works first time at least |
|---|---|---|---|---|
| Support bot answerInstructions, three help-centre passages and the customer's question in; a short answer out. | $13.50 | $9.60 | 29% less | 72% as often as Claude Sonnet 4.5 |
| Invoice field extractionInstructions and one invoice's text in; about 15 fields as JSON out. | $11.25 | $8.00 | 29% less | 72% as often as Claude Sonnet 4.5 |
| Lead scoringScoring rules and one lead's form answers in; a score and a one-line reason out. | $5.10 | $3.60 | 29% less | 71% as often as Claude Sonnet 4.5 |
| Email reply draftInstructions and the email thread so far in; a reply of about 300 words out. | $10.50 | $7.80 | 26% less | 75% as often as Claude Sonnet 4.5 |
| TranslationInstructions and about 500 words of text in; the same text in another language out. | $14.70 | $11.40 | 22% less | 78% as often as Claude Sonnet 4.5 |
| Search re-rankingA search query and 20 result snippets in; the ids of the best five, in order, out. | $12.75 | $8.60 | 33% less | 68% as often as Claude Sonnet 4.5 |
Token counts are typical sizes, not measurements.
Claude Sonnet 4.5 is being shut down
Anthropic has announced Claude Sonnet 4.5's API shutdown for 2026-11-30, with claude-sonnet-5-5 as the replacement (source).
Test it on your own prompt
The model switch test runs your prompt on both models side by side with your own API key, in your browser.