Claude Sonnet 5.5 vs GPT-5.5: cost compared
Across 8 common app types, Claude Sonnet 5.5 is on average 2.7× cheaper. Claude Sonnet 5.5 is cheaper in 8 of 8 scenarios. Quality index: Claude Sonnet 5.5 56 vs GPT-5.5 38.4.
| Price (per 1M tokens) | Claude Sonnet 5.5 | GPT-5.5 |
|---|---|---|
| Input | $2 | $5 |
| Output | $10 | $30 |
| Cached input | $0.1 | $0.5 |
| Context window | 1,000,000 | 1,050,000 |
| Batch pricing | yes | yes |
Monthly cost by app type
| App | Claude Sonnet 5.5 | GPT-5.5 | |
|---|---|---|---|
| AI chatbot | $2,178 | $6,053 | tweak → |
| RAG app | $1,678 | $4,458 | tweak → |
| AI coding agent | $44,109 | $117,209 | tweak → |
| Discord bot | $2,496 | $6,584 | tweak → |
| image / vision app | $266 | $725 | tweak → |
| customer support agent | $5,764 | $14,805 | tweak → |
| document summarizer | $500 | $1,326 | tweak → |
| AI writing tool | $1,594 | $4,573 | tweak → |
Prices only tell half the story. If Claude Sonnet 5.5 is good enough for most of your traffic, route easy requests there and save the other model for the hard ones; the calculator's "cheapest smart mix" estimates that split.
Compare them in the calculator →
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Prices: OpenRouter list prices (USD per 1M tokens), updated 2026-10-15. Estimates only; a month is 30 days. See how the math works.