GPT-5.6 Terra
OpenAIReleased Jul 9, 2026Closed weightsgpt-5.6-terra
- Intelligence (Epoch)
- 160 · 12th of 111
- Reasoning
- yes, with effort levels
- Knowledge cutoff
- February 2026
- Context
- 1M tokens
- Max output
- 128K tokens
- Input
- text, image
- API features
- tools, structured outputs, JSON mode, seed
- OpenAI's API
- yes, as gpt-5.6-terra
Read Oct 23, 06:00 UTC from the hosts' published offers and OpenRouter, spec sheet from OpenAI · cutoff: platform.openai.com
Intelligence for the price
4 models score higher for the same price or less; it ranks 5 of the 101 models at its price or below.
Epoch Capabilities Index against the lowest input + output price per M, log scale · prices Oct 23. Score: Epoch AI, CC BY 4.0, 160 with an interval of 157 to 163.
Against its rivals
The best of its price range and the top score
- GPT-5.6 Terrathis model$14.00160
- Claude Opus 5.5top score$24.00169
- GPT-6.1 Solsame price range$12.00168
- Claude Sonnet 5.5same price range$12.00166
Same level for 30× less: DeepSeek V4.1 Flash at Io Net, $0.47 per M input + output · their Epoch intervals overlap (156 against 160).
Bars: Epoch Capabilities Index (Epoch AI, CC BY 4.0), drawn from 100, below the lowest score in the catalogue · price: lowest input + output per M.
Speed by provider
Output speed of GPT-5.6 Terra at each host, fastest first
- Amazon Bedrock88 tok/s1.83 s to first token
- OpenAI68 tok/s1.95 s to first token
- Azure OpenAI55 tok/s2.18 s to first token
Speed: OpenRouter, median of the last 30 min, read Oct 23, 06:00 UTC · a snapshot of real traffic before the daily read, not a daily average · bars from zero.
| Provider | Input | Output | Cache ↑ | tok/s | First token | Uptime 24h | Checked |
|---|---|---|---|---|---|---|---|
| OpenAI | $2.00 | $12.00 | $0.20 | 68 | 1.95 s | 100% | Oct 23 |
| Azure OpenAI | $2.00 | $12.00 | $0.20 | 55 | 2.18 s | 100% | Oct 23 |
| Amazon Bedrock | $2.20 | $13.20 | $0.22 | 88 | 1.83 s | — | Oct 23 |
3 of 3 providers · prices per million tokens, read Oct 23, 06:00 UTC · speed: OpenRouter, median of the last 30 min, read Oct 23, 06:00 UTC · uptime: OpenRouter, last 24 h
| Provider | Weights | Context | Max output | Tools | Structured outputs | Reasoning |
|---|---|---|---|---|---|---|
| OpenAI | — | 1.05M | 125K | yes | yes | yes |
| Azure OpenAI | — | 1.05M | 125K | yes | yes | yes |
| Amazon Bedrock | — | 1.05M | 125K | yes | yes | yes |
As served by each host and declared to OpenRouter; not verified by us · weights: the precision the host declares
GPT-5.6 Terra spec sheet, field by field, with sources
GPT-5.6 Terra spec sheetmaker-declared
What OpenAI declares about the model itself — read from its own weights repository and documentation, not from any host. What each endpoint actually serves is in the pricing above: the two can differ, and both are true.
- Context window
- 1,050,000 tokens
- Parameters
- not published by the maker
- Active experts
- not published by the maker
- Weight precision
- not applicable — no weights publishedcurated
- License
- Proprietary — API onlycuratedScope: the licence on the published weights, and nothing else. It is not the maker's acceptable-use policy, which is a separate document, and it is not the contract you sign with whichever host you call — hosts set their own terms, which this index does not read.
- Knowledge cutoff
- February 16, 2026
- Modalities
- text · image → text
- Max output (official)
- 128,000 tokens
- Release date
- July 9, 2026maker's docs · read 2026-09-07
- Maker lifecycle status
- General availabilitymaker's docs · read 2026-09-19
developers.openai.com · maker's documentation · read 2026-09-19 · 7 of 10 fields published by the maker
| Provider | Chatbot 1,000 in / 500 out | RAG / long context 8,000 in / 500 out | Batch summarize 4,000 in / 1,000 out |
|---|---|---|---|
| OpenAI | $8.00 | $22.00 | $20.00 |
| Azure OpenAI | $8.00 | $22.00 | $20.00 |
| Amazon Bedrock | $8.80 | $24.20 | $22.00 |
What each host bills for 1,000 requests of a representative job
Your own workload
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