Claude Sonnet 5 vs GPT-5.5
Rank, tier, score and price side by side, from our weekly rankings. Scores are editorial opinion based on public sources.
A
Claude Sonnet 5
B
GPT-5.5
- ProviderAnthropicOpenAI
- Rank#20Higher rank#23
- TierAA
- Score84.8Higher score84.0
- PriceAPI $2 input / $10 output per 1M tokens (legacy model)Lower price tierAPI $5 input / $30 output per 1M tokens
- TaglineAnthropic's June 2026 Sonnet model for large-scale coding and agentic work, now a legacy model succeeded by Sonnet 5.5 (September 2026) at the same price.OpenAI's April 2026 flagship for complex professional and agentic coding work, since followed by the GPT-5.6 family (July 2026) and GPT-6 Astra (September 2026).
| Attribute | Claude Sonnet 5 | GPT-5.5 |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Rank | #20Higher rank | #23 |
| Tier | A | A |
| Score | 84.8Higher score | 84.0 |
| Price | API $2 input / $10 output per 1M tokens (legacy model)Lower price tier | API $5 input / $30 output per 1M tokens |
| Tagline | Anthropic's June 2026 Sonnet model for large-scale coding and agentic work, now a legacy model succeeded by Sonnet 5.5 (September 2026) at the same price. | OpenAI's April 2026 flagship for complex professional and agentic coding work, since followed by the GPT-5.6 family (July 2026) and GPT-6 Astra (September 2026). |