Claude Sonnet 4.5 vs Claude Sonnet 5.5
anthropic/claude-sonnet-4.5 · anthropic/claude-sonnet-5.5
As of November 9, 2026, Claude Sonnet 5.5 is the cheaper API on UberLLM: $0.1336 per million input tokens and $0.6680 per million output, versus $0.7035 / $3.52 for Claude Sonnet 4.5, about 81% less when output is 3 tokens for every input token. These are the best prices on the market right now. Both work with one OpenAI-compatible key and UberLLM adds no fee. Choose Claude Sonnet 5.5 to cut cost; choose Claude Sonnet 4.5 when its capabilities fit your task better.
Claude Sonnet 4.5 vs Claude Sonnet 5.5, side by side
| Spec | Claude Sonnet 4.5 | Claude Sonnet 5.5 |
|---|---|---|
| Price · input / 1M | $0.7035 | $0.1336 |
| Price · output / 1M | $3.52 | $0.6680 |
| Context length | 198,000 | 1,000,000 |
| Max output tokens | 64,000 | 128,000 |
| Input modalities | text, image | text, image, file |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | Yes | Yes |
| Reasoning | Yes | Yes |
| % off list | 76.6% off | 93.3% off |
| First token, median (7 days) | — | 2.2 s (336 requests) |
Best prices on UberLLM right now. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated November 9, 2026. A price more than 70% below list is what buyers were billed, not an error. Why so cheap?
Claude Sonnet 4.5 vs Claude Sonnet 5.5 — FAQ
Is Claude Sonnet 4.5 or Claude Sonnet 5.5 cheaper?
Claude Sonnet 5.5 is cheaper on a blended token mix, by about 81%. A request costs what its provider charged, UberLLM adds no fee, and every request is listed with its cost in Activity.
What's the price difference between Claude Sonnet 4.5 and Claude Sonnet 5.5?
Claude Sonnet 4.5: $0.7035 in / $3.52 out per 1M tokens. Claude Sonnet 5.5: $0.1336 in / $0.6680 out per 1M tokens. That's roughly a 81% blended difference. Prices are live; UberLLM adds no fee.
Can I use both Claude Sonnet 4.5 and Claude Sonnet 5.5 with one API?
Yes. Both are served through a single OpenAI-compatible endpoint — set the base URL to https://api.uberllm.dev/v1 and your UberLLM key, then switch between them by changing the model id. Anthropic SDKs work via https://api.uberllm.dev/v1/messages.