Claude Sonnet 5.5 vs GPT-5.6 Terra
A cost comparison of two tracked mid tiers. Tier roles do not establish equal capability, quality or speed.
| Model / service | Tier | Input / 1M | Output / 1M | Observation |
|---|---|---|---|---|
| Claude Sonnet 5.5 Anthropic | Mid | $2.00 | $10.00 | 2026-10-05 Verified |
| GPT-5.6 Terra OpenAI | Mid | $2.00 | $12.00 | 2026-10-05 Verified |
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These are recorded base standard list rates in USD per million tokens. Promotions, long-context surcharges, Batch, cache write/storage and other service charges can change the bill. Use the calculator for its supported workload rules and check the linked provider terms. A carried observation is the last known rate, not a fresh verification.
Claude Sonnet 5.5: context capacity 1M. Official Anthropic pricing source.
GPT-5.6 Terra: context capacity 1M. Official OpenAI pricing source.
What would 100,000 English words cost?
Using TokenScale’s estimate of 4 tokens per 3 English words, 100,000 words is about 133,333 tokens. Each column below bills only that direction at the recorded base rate; it is not a complete conversation bill. Language, tokenization, context limits and provider terms can change the result. These are calculations, not provider quotes.
| Model | Input only | Output only |
|---|---|---|
| Claude Sonnet 5.5 | $0.2667 | $1.33 |
| GPT-5.6 Terra | $0.2667 | $1.60 |
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