How much does GPT-5.6 Terra cost?

$2 per million input tokens and $12 per million output tokens at list price, with cached input at $0.2. The cheapest route is $1 in and $6 out. Hoodgen bills in credits (1 credit = Rs 0.10) and shows the estimate before you send.

What is the context window of GPT-5.6 Terra?

1,050,000 input tokens with up to 128,000 output tokens.

Is GPT-5.6 Terra good for coding?

It is built for multi step work: read a failure, form a hypothesis, patch, re-run.

Does GPT-5.6 Terra accept images, audio or files?

It accepts file, image, text and returns text. Drop an image into the Hoodgen composer and ask about it directly.

How fast is GPT-5.6 Terra?

70.62s to first token and 106 tokens per second, measured by Artificial Analysis.

What is the Artificial Analysis score of GPT-5.6 Terra?

32 on Artificial Analysis Intelligence Index v5.0.1, ranked #47 of 74.

How do I use GPT-5.6 Terra on Hoodgen?

Open Chat, pick GPT-5.6 Terra in the model menu and send a prompt. No API key, no card, paid in credits. It is also selectable inside Coding, Writer and the other tools.

OpenaiReasoningReleased 9 July 2026

GPT-5.6 Terra pricing, context and benchmark

GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier.

Chat with GPT-5.6 Terra

1.05M

Input context

128K

Output context

Official input

$12

Official output

AA index

01 · Model Overview

Everything that matters, in one table

Context, pricing, cache, modalities and tooling, from the model registry and Artificial Analysis.

Model	GPT-5.6 Terra
Model ID	openai/gpt-5.6-terra
Provider	Openai
Release date	9 July 2026
Status	Generally available
Input context	1,050,000 tokens
Output context	128,000 tokens
Official input pricing	$2 per 1M tokens
Official output pricing	$12 per 1M tokens
Cache read pricing	$0.2 per 1M tokens (90% off input)
Market input pricing	$1 per 1M (cheapest route)
Market output pricing	$6 per 1M (cheapest route)
Highest route pricing	$4 in, $24 out per 1M
Input modalities	file · image · text
Output modalities	text
Reasoning control	Not exposed
Tool support	Text generation only
Tokenizer	GPT
Provider routes	7 endpoints
Artificial Analysis index	32 (#47 of 74)
Speed	106 tokens/s, 70.62s to first token
Knowledge cutoff	Not publicly stated

Input and output support

Modality	Input	Output	Billed at
Text	✓ yes	✓ yes	$2 in
Image	✓ yes	no	$2 in
Audio	no	no	not supported
Video	no	no	not supported
File (PDF)	✓ yes	no	$2 in

02 · Overview

What is GPT-5.6 Terra?

GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier.

It is suited for everyday coding, reasoning, and agentic...

GPT-5.6 Terra carries a 1.05M token window, uses the GPT tokenizer and is served by Openai. On Hoodgen it sits in the Reasoning tier of the model menu next to its siblings, so you can switch mid conversation without losing the thread.

03 · Release

Release and what changed from the previous version

Released9 July 2026

Property	GPT-5.6 Sol Pro	GPT-5.6 Terra	Change
Released	2026	2026	Same release window
Context	1.05M	1.05M	Unchanged
Max output	128K	128K	Unchanged
Input price	$4	$2	Cheaper
Output price	$20	$12	Cheaper
Input modalities	file, image, text	file, image, text	Unchanged
AA index	n/a	32	Newer benchmark run

04 · Capabilities

Features and capabilities

◉

Vision

Screenshots, charts and photographed documents are read at the text token rate.

▤

Files and PDFs

Documents go in as files rather than pasted text, keeping layout and tables intact.

⚡

Prompt caching

Cached input costs $0.2 per million instead of $2, so stable prefixes get cheaper.

06 · Benchmarks

Benchmark results and performance

Artificial Analysis Intelligence Index v5.0.1 blends nine evaluations. GPT-5.6 Terra scores 32 , ranking #47 of 74.

Intelligence index

#47 of 74

Cost per task

$3.73

weighted average per index task

Time per task

10.4m

inference time

Output speed

106

tokens per second

Index score and cost per task

Index score#47 of 74

Cost per taskUSD

$3.73

Scale: index 0 to 70, cost 0 to $20. Sub scores are not published per evaluation, so none are invented here.

07 · Use cases

What can you do with GPT-5.6 Terra?

Debugging and root cause

Multi file failures where the model has to hold a causal chain before answering.

Architecture and planning

Design docs, migration plans and trade off analysis over long context.

Data analysis

Spreadsheets and logs read in one pass, then summarised with the numbers quoted back.

Agentic coding

Repo wide changes that need plan, edit and verify loops.

08 · Cost levers

Prompt caching and how to cut the bill

Cached input bills at $0.2 per million instead of $2, a 90% discount. Keep the system prompt and documents first and the changing question last, so every call hits the cache.

09 · Pricing

GPT-5.6 Terra pricing

Official pricing

List price

$2 / 1M in

$12 / 1M out

$0.2 cached input
1.05M context
file, image, text input

Cheapest route

$1 / 1M in

$6 / 1M out

7 routes on OpenRouter
What Hoodgen routes to first
Same model, lower bill

Highest route

$4 / 1M in

$24 / 1M out

Priority or premium tier
Best under load
Use for latency critical calls

Market pricing, every route

Provider	Tier	Input	Output	Cache read	Uptime 24h
OpenAI	flex	$1	$6	$0.1	99.0%
Azure	standard	$2	$12	$0.2	100.0%
OpenAI	standard	$2	$12	$0.2	97.8%
Azure	standard	$2.2	$13.2	$0.22	100.0%
Amazon Bedrock	standard	$2.2	$13.2	$0.22	100.0%
Azure	standard	$2.2	$13.2	$0.22	100.0%
OpenAI	priority	$4	$24	$0.4	97.6%

API pricing and cost calculator

Input tokens per callOutput tokens per callCache hit %Number of calls

Rate	Per call	Total	Credits
Cheapest route	$0.0182	$9.10	8645
List price	$0.0364	$18.20	17290
Highest route	$0.1160	$58.00	55100

10 · Developers

API and developer information

Model ID	openai/gpt-5.6-terra
Endpoint	https://openrouter.ai/api/v1/chat/completions
Parameters	prompt and max_tokens
Streaming	Yes, server sent events
Modality string	text+image+file->text
Max prompt tokens	1,050,000
Max completion tokens	128,000

curl https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.6-terra",
    "messages": [{ "role": "user", "content": "Summarise this document." }],
    "max_tokens": 1024
  }'

11 · Limitations

Model limitations

Text only output	It cannot generate images, audio or video. Pair it with an image model on Hoodgen when you need visuals.
Output cap	128,000 tokens per request. Long deliverables have to be chunked.
Knowledge cutoff	The provider does not state a fixed cutoff for every release. Verify very recent events against search.

12 · Comparison

GPT-5.6 Terra vs other Openai models

Model	Context	Input /1M	Output /1M	AA index	Released
GPT-5.6 Terra	1.05M	$2	$12	32	2026
GPT-6 Astra	1.05M	$10	$50	57	Sep 2026
GPT-6 Astra Pro	1.05M	$10	$50	n/a	Sep 2026
GPT-5.6 Sol	1.05M	$4	$20	n/a	2026
GPT-5.6 Sol Pro	1.05M	$4	$20	n/a	2026
GPT-5.6 Terra Pro	1.05M	$2	$12	n/a	2026

13 · Privacy

Privacy and data policy

On Hoodgen, prompts and attachments answer that request and stay in your conversation history so you can reopen it. They are not used to train models.
Requests route through OpenRouter to Openai and are covered by that provider's API terms.
Do not paste secrets or personal data you would not send to any hosted model.

14 · FAQ

GPT-5.6 Terra questions, answered

GPT-5.6 Terra is a reasoning model from Openai, released 9 July 2026. GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier.

✦

Start chatting with GPT-5.6 Terra

Free to try on Hoodgen AI, with a live credit estimate before every send. No API key, no setup.

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