Models / OpenAI/ GPT-5.6 Terra Pro

GPT-5.6 Terra Pro

Name: GPT-5.6 Terra Pro
Author: OpenAI

OpenAI · released Jul 9, 2026

InputOutput

Type: Proprietary
Input: $2.50
Output: $15.00
Cached: Not published

List price · per 1M tokens · OpenAI at 1.1M context · source ↗ · a reseller below undercuts it; the table carries the spread

Our take

Written Aug 3, 2026

GPT-5.6 Terra Pro is OpenAI's proprietary flagship that can handle up to 1.05 million tokens in a single request, accepting text, images and files. It is positioned for long-document and multimodal workloads, though no benchmark scores are available to verify its performance.

Who should pick it

Pick this for analysing entire books or large file collections in one pass, or multimodal work combining text, images and documents. Choose the cheapest tier if 151 tokens per second suffices, or pricier tiers for faster response. Skip it if you need benchmark scores to compare alternatives, or if steep output-cost jumps across tiers break your budget.

The case for it

Exceptionally large request limit of 1.05 million tokens, enabling analysis of entire books or extensive file collections in a single pass.
Tiered pricing allows throughput-quality tradeoffs, with the same model available across a wide price range.
Broad multimodal input: accepts text, images and files.

The case against it

No measured quality scores in our data — no Elo, MMLU or task scores to verify performance claims.
Output costs rise steeply across tiers, with the top tier far above the cheapest.
Throughput is unverified for half of the tracked offers, including the mid-market OpenRouter tier.

How good is it?

Nothing measured, on any board we watch.

We hold no score for this model.

We look for every model we track on every board we watch, and none of them has turned up GPT-5.6 Terra Pro — so there is no intelligence, coding, agentic or writing score to show you, not a low one, none.

The boards we watch →

Or rent it from someone else

3 providers, from 6 listings.

Cheapest published offer

OpenRouter

Why this differs from the header. The strip above quotes OpenAI's own list price. This is the cheapest live offer at the widest standard context we hold, whoever is serving it — a reseller undercutting a lab is ordinary commerce, not an error.

per 1M tokens: $1.00 in / $6.00 out
Context served: 1.1M
Throughput: Not measured

Current provider offers with price, context and prompt-privacy answers
Provider	In / out per 1M tokens	Context	Throughput	Trains on prompts	Logs prompts	Zero retention
OpenAIflex tier	$0.50 / $3.00	1.1M	151 tok/s	No	Yesunknown period	Unknown
OpenRouter	$1.00 / $6.00	1.1M	not measured	Unknown	Unknown	Unknown
Microsoft Azure AI	$2.50 / $15.00	1.1M	88 tok/s	No	No	Confirmed
OpenAI	$2.50 / $15.00	1.1M	not measured	No	Yesunknown period	Unknown
Microsoft Azure AIeu	$2.75 / $16.50	1.1M	144 tok/s	No	No	Confirmed
OpenAIpriority tier	$5.00 / $30.00	1.1M	not measured	No	Yesunknown period	Unknown

Across the 6 listings we hold: 5 say they do not train on prompts, 0 say they do and 1 do not say. 2 appear in the zero-retention registry we check; the rest are unknown to us rather than confirmed either way.

What each host's API supports

From the parameter list each endpoint publishes. Streaming is omitted: nothing we hold reports it, for any model.

✓
Supported: ✗
Not supported
Not published: host gave no parameter list

API features per host
Provider	Tool calling	JSON output	Strict schema
OpenAIflex	✓	✓	✓
OpenRouter	✓	✓	✓
Microsoft Azure AI	✓	✓	✓
OpenAI	✓	✓	✓
Microsoft Azure AIeu	✓	✓	✓
OpenAIpriority	✓	✓	✓

Tool calling: 6 of 6 listings say yes. JSON output: 6 of 6 listings say yes. Strict schema: 6 of 6 listings say yes.

When we formed this view

And whether anything has moved since.

Dates behind this page

Jul 30, 2026Price changeGPT-5.6 Terra Pro cut across 2 hosts, by up to 20% at OpenRouterGPT-5.6 Terra Pro moved on 2 hosts: OpenRouter: input −20% ($1.25 → $1.00 per 1M tokens); output −20% ($7.50 → $6.00 per 1M tokens); cache read −20% ($0.13 → $0.10 per 1M tokens); cache write −20% ($1.56 → $1.25 per 1M tokens); OpenAI: input −20% ($0.63 → $0.50 per 1M tokens); output −20% ($3.75 → $3.00 per 1M tokens); cache read −20% ($0.063 → $0.050 per 1M tokens); cache write −20% ($0.78 → $0.63 per 1M tokens)detected

Jul 28, 2026Price changeopenrouter repriced openai/gpt-5.6-terra-proinput $2.5 → $1.25, output $15 → $7.5 per 1M tokensdetected

Jul 28, 2026Price changeopenai repriced openai/gpt-5.6-terra-proinput $1.25 → $0.625, output $7.5 → $3.75 per 1M tokensdetected

Jul 26, 2026ListedListed on LLMapfirst indexed by our pipelinedetected

Jul 9, 2026AnnouncedGPT-5.6 Terra Pro announced by OpenAIannounced

Prices last checked 9d ago

What we do not know about this model yet

No board we watch has turned up a score, so we hold no quality figures at all.
Nothing we hold says whether an endpoint streams, so we do not show it either way.
1 of 6 listings do not say whether they train on prompts.

Licence and identifiers

What the licence allowsWe hold no licence record for this model. Inside are the identifiers you need to pull it — its Hugging Face repo where we have one, our slug and a machine-readable card.

Licence

Commercial API terms. We hold no licence record for this model, so there is nothing to summarise here.

Identifiers

Modality record: text+image+file->text
Catalogue slug: openai-gpt-5-6-terra-pro

Machine-readable model card (omc.json) →

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