Claude Sonnet 5 vs GPT-5.5
anthropic/claude-sonnet-5 · openai/gpt-5.5
As of October 26, 2026, Claude Sonnet 5 is the cheaper API on UberLLM: $0.3400 per million input tokens and $1.70 per million output, versus $1.10 / $6.60 for GPT-5.5 — about 74% less on a blended 3:1 token mix. Both are reached through one OpenAI-compatible key and routed to the cheapest healthy seller, with no UberLLM fee added, so the price you see is the price you pay. Choose Claude Sonnet 5 to cut cost; choose GPT-5.5 when its capabilities fit your task better.
Claude Sonnet 5 vs GPT-5.5, side by side
| Spec | Claude Sonnet 5 | GPT-5.5 |
|---|---|---|
| Price · input / 1M | $0.3400 | $1.10 |
| Price · output / 1M | $1.70 | $6.60 |
| Context length | 1,000,000 | 1,000,000 |
| Max output tokens | 64,000 | 128,000 |
| Input modalities | text | text, image |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | — | Yes |
| Reasoning | Yes | — |
| Cheapest seller | UberLLM | UberLLM |
| % off list | 83% off | 78% off |
Live prices via UberLLM, routed to the cheapest healthy seller. The price shown has no UberLLM fee added. Updated October 26, 2026.
Claude Sonnet 5 vs GPT-5.5 — FAQ
Is Claude Sonnet 5 or GPT-5.5 cheaper?
Claude Sonnet 5 is cheaper on a blended token mix, by about 74%. UberLLM routes every request to the cheapest healthy seller and bills the price shown, with no fee added.
What's the price difference between Claude Sonnet 5 and GPT-5.5?
Claude Sonnet 5: $0.3400 in / $1.70 out per 1M tokens. GPT-5.5: $1.10 in / $6.60 out per 1M tokens. That's roughly a 74% blended difference. Prices are live; UberLLM adds no fee.
Can I use both Claude Sonnet 5 and GPT-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.