Anthropic: Claude Sonnet 5.5 vs OpenAI: GPT-5.6 Sol
anthropic vs openai
On price, Anthropic: Claude Sonnet 5.5 is cheaper (blended cost is about 0.50× that of OpenAI: GPT-5.6 Sol).
On capability, Anthropic: Claude Sonnet 5.5 has the higher intelligence index (55) — better for complex reasoning.
Verdict: pick Anthropic: Claude Sonnet 5.5 on a budget, or Anthropic: Claude Sonnet 5.5 for output quality. Full details below.
Side-by-Side Specs
| Metric | Anthropic: Claude Sonnet 5.5 | OpenAI: GPT-5.6 Sol |
|---|---|---|
| Input /1M | $2.00 | $4.00 |
| Output /1M | $10.00 | $20.00 |
| Blended (3:1) | $4.00 | $8.00 |
| Context | 1.0M | 1.1M |
| Intelligence | 55 | 47 |
| Coding | — | 77 |
| Math | — | — |
| Speed | 136 tok/s | 106 tok/s |
| CPS Grade | A | A |
FAQ
Which is cheaper, Anthropic: Claude Sonnet 5.5 or OpenAI: GPT-5.6 Sol?
On price, Anthropic: Claude Sonnet 5.5 is cheaper (blended cost is about 0.50× that of OpenAI: GPT-5.6 Sol). Anthropic: Claude Sonnet 5.5: $2 in / $10 out; OpenAI: GPT-5.6 Sol: $4 in / $20 out (per 1M tokens).
Which is smarter, Anthropic: Claude Sonnet 5.5 or OpenAI: GPT-5.6 Sol?
On capability, Anthropic: Claude Sonnet 5.5 has the higher intelligence index (55) — better for complex reasoning. Coding index: Anthropic: Claude Sonnet 5.5 — vs OpenAI: GPT-5.6 Sol 77.
Which one should I choose?
Verdict: pick Anthropic: Claude Sonnet 5.5 on a budget, or Anthropic: Claude Sonnet 5.5 for output quality. Full details below.