Model comparison
Claude Sonnet 5 vs GPT-5.6 Terra
GPT-5.6 Terra is the cheaper of the two on input tokens, by a factor of 1.5. Claude Sonnet 5 lists $3 in and $15 out per million tokens with a 1M context window; GPT-5.6 Terra lists $2 and $12 with 1M.
| Claude Sonnet 5 | GPT-5.6 Terra | |
|---|---|---|
| Developer | Anthropic | OpenAI |
| Input / 1M tokens | $3 | $2 |
| Output / 1M tokens | $15 | $12 |
| Context window | 1M | 1M |
| Max output | 128K | - |
| Modality | Multimodal | Multimodal |
| Open weights | No | No |
| Released | 2026 | 2026 |
| Source | Provider documentation | Secondary, verify |
| Illustrative month* | $180 | $132 |
* 100 calls a day, about 10,000 tokens in and 2,000 out each, at list price, before caching, batching or volume discounts. Illustrative only. Pricing and context data verified 2026-08-07; "Secondary" figures come from pricing aggregators and trade press, so check the provider before relying on them. No benchmark scores: see methodology.
Claude Sonnet 5
The best balance of speed and intelligence in Anthropic's line, reaching what was previously Opus-tier quality on a lot of coding and agentic work. The default choice for most production applications.
- Watch: New tokenizer: roughly 30% more tokens for the same text vs Sonnet 4.6
GPT-5.6 Terra
The mid tier of the GPT-5.6 family: OpenAI's general-purpose workhorse and the closest direct competitor to Claude Sonnet 5 and Gemini 3.1 Pro on price.
GPT-5.6 Terra in full →Other comparisons