Claude Sonnet 5.5 vs Grok 4.3
anthropic/claude-sonnet-5.5 · x-ai/grok-4.3
As of October 28, 2026, Claude Sonnet 5.5 is the cheaper API on UberLLM: $0.1000 per million input tokens and $0.5000 per million output, versus $0.5250 / $1.05 for Grok 4.3 — about 56% 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 5.5 to cut cost; choose Grok 4.3 when its capabilities fit your task better.
Claude Sonnet 5.5 vs Grok 4.3, side by side
| Spec | Claude Sonnet 5.5 | Grok 4.3 |
|---|---|---|
| Price · input / 1M | $0.1000 | $0.5250 |
| Price · output / 1M | $0.5000 | $1.05 |
| Context length | 1,000,000 | 1,000,000 |
| Max output tokens | 128,000 | 128,000 |
| Input modalities | text, image, file | text, image |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | Yes | Yes |
| Reasoning | Yes | — |
| Cheapest seller | Vietapi | UberLLM |
| % off list | 95% off | 58% off |
Live prices via UberLLM, routed to the cheapest healthy seller. The price shown has no UberLLM fee added. Updated October 28, 2026.
Claude Sonnet 5.5 vs Grok 4.3 — FAQ
Is Claude Sonnet 5.5 or Grok 4.3 cheaper?
Claude Sonnet 5.5 is cheaper on a blended token mix, by about 56%. 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 5.5 and Grok 4.3?
Claude Sonnet 5.5: $0.1000 in / $0.5000 out per 1M tokens. Grok 4.3: $0.5250 in / $1.05 out per 1M tokens. That's roughly a 56% blended difference. Prices are live; UberLLM adds no fee.
Can I use both Claude Sonnet 5.5 and Grok 4.3 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.