GPT-5.6 Terra pricing
OpenAI · API id gpt-5.6-terra · verified 2026-10-18
| Input | $2.00 |
| Cached input (cache hit) | $0.20 |
| Cache write | $2.50 |
| Output | $12.00 |
| Batch discount | 50% |
| Context window | 1,050,000 tokens |
| Max output | 128,000 tokens |
| Above 272K prompt tokens | $4.00 in / $18.00 out |
USD per 1M tokens unless noted. Official source
Estimate your workload on GPT-5.6 Terra →
What GPT-5.6 Terra costs for real workloads
| Workload | GPT-5.6 Terra | Grok 4.3 | Gemini 3.8 Flash | Gemini 3.6 Flash | Mistral Medium 3.5 |
|---|---|---|---|---|---|
| 10,000 chatbot replies 2,000 input + 400 output tokens each, 50% of the prompt cached | $70.00 | $24.50 | $23.25 | $23.25 | $46.50 |
| One 30-step coding agent run 12K system + tools prompt, 1K output and 3K tool result per step, caching on | $1.09 | $0.64 | $0.36 | $0.36 | $0.72 |
| 1M documents classified (batch) 600 input + 20 output tokens each, batch API where available | $720 | $640 | $263 | $263 | $525 |
Compared with the cheapest other mid models. Change the numbers in the calculator.
Billing notes
Previous generation. Long context: prompts >272K input tokens bill the whole request at 2x input/cache and 1.5x output. Reasoning tokens billed as output. Regional/data-residency endpoints +10%.
Where GPT-5.6 Terra ranks by use case
Position by cost among all models that fit each workload (1 = cheapest).
- Cheapest LLM for coding agents: #27 of 36 (Per run (cached): $1.09)
- Cheapest LLM for RAG chatbots: #28 of 36 (Per 1,000 answers: $14.10)
- Cheapest LLM for batch classification and extraction: #26 of 36 (Classify 1M docs: $720)
- Long-context document analysis (400K tokens): #22 of 29 (10 questions, cached: $3.81)
- Cheapest LLM for high-volume customer support: #28 of 36 (Per 1,000 replies: $5.90)
Counting tokens for a prompt? The token counter estimates GPT-5.6 Terra tokens (OpenAI (o200k_base) tokenizer) and input cost.
Other OpenAI models
- GPT-6 Astra: $10.00 / $50.00
- GPT-5.5: $5.00 / $30.00
- GPT-5.6 Sol: $4.00 / $20.00
- GPT-6.1 Sol: $2.00 / $10.00
- GPT-6 Sol: $2.00 / $10.00
- GPT-5.4 mini: $0.75 / $4.50
- GPT-5.6 Luna: $0.20 / $1.20
- GPT-6 Luna: $0.10 / $0.50
FAQ
How much does GPT-5.6 Terra cost per 1M tokens?
GPT-5.6 Terra costs $2.00 per 1M input tokens and $12.00 per 1M output tokens at standard rates (verified 2026-10-18).
Does GPT-5.6 Terra support prompt caching?
Yes. Cached input is billed at $0.20 per 1M tokens, and writing to the cache costs $2.50 per 1M tokens.
Is there a batch discount for GPT-5.6 Terra?
Yes. The batch API is 50% cheaper than standard requests.
What is the context window of GPT-5.6 Terra?
1,050,000 tokens, with up to 128,000 output tokens. Prompts over 272,000 tokens are billed at $4.00 input and $18.00 output for the whole request.