Where is the GPT-5.6 Terra Pro documentation?

The GPT-5.6 Terra Pro documentation on OpenRouter includes the GPT-5.6 Migration Guide cookbook and the GPT 5.6 Discounts & Jevons Paradox blog post. The quickstart covers API keys and your first request, and the API reference lists every parameter.

How much does GPT-5.6 Terra Pro cost?

GPT-5.6 Terra Pro costs $2.00/M input tokens and $12.00/M output tokens, with separate rates for Cache Read at $0.20/M tokens, Cache Write at $2.50/M tokens, and Web Search at $10.00/1K calls.

What is the context length of GPT-5.6 Terra Pro?

GPT-5.6 Terra Pro has a 1,050,000 token context window. It supports up to 128,000 completion tokens.

Does GPT-5.6 Terra Pro support tool calling and structured outputs?

Yes. GPT-5.6 Terra Pro accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Can I disable prompt caching for GPT-5.6 Terra Pro?

Yes. OpenAI caches prompts of 1024 tokens or more automatically, and GPT-5.6 Terra Pro bills a cache write on each cached prompt whether or not the cached prefix is read again. To turn caching off for a request, set prompt_cache_options.mode to "explicit" at the request root and do not mark any content block with prompt_cache_breakpoint. Explicit mode disables OpenAI-managed breakpoints, so a request with none of your own has no cacheable prefix and is billed at the plain input rate. See the prompt caching guide.

What inputs and outputs does GPT-5.6 Terra Pro support?

GPT-5.6 Terra Pro accepts files such as PDFs, images, and text as input and returns text.

Which providers serve GPT-5.6 Terra Pro?

GPT-5.6 Terra Pro is served by 2 providers on OpenRouter: OpenAI and Azure. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

When was GPT-5.6 Terra Pro released?

GPT-5.6 Terra Pro was released on July 9, 2026. Its knowledge cutoff is February 16, 2026.

OpenAI: GPT-5.6 Terra Pro

openai/gpt-5.6-terra-pro

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GPT-5.6 Terra Pro is the same underlying model as GPT-5.6 Terra, served with reasoning.mode set to pro for higher-quality responses on complex tasks.

Cost note: pro mode spends far more reasoning tokens per request, so a typical request costs several times more than the same request on GPT-5.6 Terra and takes much longer to complete. It is intended for hard, high-stakes problems where the extra accuracy justifies the cost. For everyday coding, agentic, and chat workloads, use GPT-5.6 Terra instead.

Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

Modalities

In / out price

$2 / $12per 1M

Context

1.1M

Released

Jul 9, 2026

Knowledge cutoff

Feb 2026

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick: Balanced (price + speed), Nitro (fastest), or Floor (cheapest).

Latency / throughput


	$2.00	$12.00	$0.20	6.68s	125 tok/s	100.00%
	$2.00	$12.00	$0.20	1.93s	68 tok/s	100.00%
Not used in Standard routing:Why these endpoints are not used
Flex	$1.00	$6.00	$0.10	2.00s	28 tok/s	--
	$2.20	$13.20	$0.22	2.26s	60 tok/s	100.00%
Fast	$4.00	$24.00	$0.40	--	--	--

Input $2.00Output $12.00
125 tok/s100.00% uptime
Input $2.00Output $12.00
68 tok/s100.00% uptime
Not used in Standard routing:Why these endpoints are not used
Input $1.00Output $6.00
Flex
28 tok/s-- uptime
Input $2.20Output $13.20
60 tok/s100.00% uptime
Input $4.00Output $24.00
Fast
-- tok/s-- uptime

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Weighted average

Input

$0.7519/M tokens

Output

$12.73/M tokens

GPT-5.6 Terra Pro — Price history

Price history

No effective price data for this selection

		$0.723	$12.71	80.8%	83.4%
		$0.902	$12.98	73.1%	14.8%
Not used in Standard routing:Why these endpoints are not used
	Flex	$0.508	$6.00	55.5%	0.1%
		$0.892	$13.20	67.5%	1.7%
	Fast	—	—	—	—

Effective in $0.723Effective out $12.71
Token share
83.4%
Effective in $0.902Effective out $12.98
Token share
14.8%
Not used in Standard routing:Why these endpoints are not used
Effective in $0.508Effective out $6.00
FlexToken share
0.1%
Effective in $0.892Effective out $13.20
Token share
1.7%
Effective in —Effective out —
FastToken share —

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Uptime (3d)

100.00%

Availability (3d)

99.34%

Availability over the last 3 days

Last 72 hours

Availability 99.34%

3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability

100.00%

Without Routing

97.77%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and provider routing options.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Kilo Code

Kilo Code is an open-source AI coding agent that works across VS Code, JetBrains, and CLI to help developers ship code faster with agentic workflows.

1.31Btokens

Hermes Agent

Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.

1.01Btokens

There are many coding agents, but this one is yours.

542Mtokens

omp

new

351Mtokens

Open WebUI

Open WebUI is a self-hosted AI platform providing a chat interface for Large Language Models.

274Mtokens

Rest of OpenRouter

334M

Top 5 Apps

8.49M

Available through EU in-region routing

OpenAI: GPT-5.6 Terra Pro is available through EU in-region routing. Requests sent to eu.openrouter.ai are decrypted in the EU and routed only to shared provider endpoints in Europe (the EU/EEA, the UK, and Switzerland).

Providers in Europe

Azure

Prices in Europe

Azure: $2.20/M tokens input, $13.20/M tokens output

Base URL

https://eu.openrouter.ai/api/v1

Plan

Requires Business or Enterprise. Self-serve on Business: no contract, no monthly minimum. OpenRouter Business for EU in-region routing

Fails closed: if no shared provider endpoint in Europe is available, the request errors instead of leaving the region. Requests served by your own BYOK key go to your deployment’s region, which you control. In-region routing docs

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Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

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GPT Astra Latest

This model always redirects to the latest model in the GPT Astra family.

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OpenAI: GPT-5.6 Terra Pro

Providers