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OpenaiReasoningReleased 9 July 2026

GPT-5.6 Terra Pro pricing, context and benchmark

GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/gpt-5.6-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks.

Chat with GPT-5.6 Terra Pro
1.05M
Input context
128K
Output context
$2
Official input
$12
Official output
n/a
AA index
01 · Model Overview

Everything that matters, in one table

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

ModelGPT-5.6 Terra Pro
Model IDopenai/gpt-5.6-terra-pro
ProviderOpenai
Release date9 July 2026
StatusGenerally available
Input context1,050,000 tokens
Output context128,000 tokens
Official input pricing$2 per 1M tokens
Official output pricing$12 per 1M tokens
Cache read pricingNot published
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 modalitiesfile · image · text
Output modalitiestext
Reasoning controlNot exposed
Tool supportText generation only
TokenizerGPT
Provider routes5 endpoints
Artificial Analysis indexNot published
SpeedNot published
Knowledge cutoffNot publicly stated

Input and output support

ModalityInputOutputBilled at
Text✓ yes✓ yes$2 in
Image✓ yesno$2 in
Audionononot supported
Videonononot supported
File (PDF)✓ yesno$2 in
02 · Overview

What is GPT-5.6 Terra Pro?

GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/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...

GPT-5.6 Terra Pro 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
PropertyGPT-5.6 TerraGPT-5.6 Terra ProChange
Released20262026Same release window
Context1.05M1.05MUnchanged
Max output128K128KUnchanged
Input price$2$2Unchanged
Output price$12$12Unchanged
Input modalitiesfile, image, textfile, image, textUnchanged
AA index32n/aNewer 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.
07 · Use cases

What can you do with GPT-5.6 Terra Pro?

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.
09 · Pricing

GPT-5.6 Terra Pro pricing

Official pricing

List price
$2 / 1M in
$12 / 1M out
  • 1.05M context
  • file, image, text input
Cheapest route
$1 / 1M in
$6 / 1M out
  • 5 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

ProviderTierInputOutputCache readUptime 24h
OpenAIflex$1$6$0.1n/a
Azurestandard$2$12$0.2100.0%
OpenAIstandard$2$12$0.2100.0%
Azurestandard$2.2$13.2$0.22100.0%
OpenAIpriority$4$24$0.4n/a

API pricing and cost calculator

RatePer callTotalCredits
Cheapest route$0.0182$9.108645
List price$0.0580$29.0027550
Highest route$0.1160$58.0055100
10 · Developers

API and developer information

Model IDopenai/gpt-5.6-terra-pro
Endpointhttps://openrouter.ai/api/v1/chat/completions
Parametersprompt and max_tokens
StreamingYes, server sent events
Modality stringtext+image+file->text
Max prompt tokens1,050,000
Max completion tokens128,000
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-pro",
    "messages": [{ "role": "user", "content": "Summarise this document." }],
    "max_tokens": 1024
  }'
11 · Limitations

Model limitations

Text only outputIt cannot generate images, audio or video. Pair it with an image model on Hoodgen when you need visuals.
Output cap128,000 tokens per request. Long deliverables have to be chunked.
Benchmarks not publishedArtificial Analysis does not publish an Intelligence Index for this release, so no benchmark score is claimed here.
Knowledge cutoffThe provider does not state a fixed cutoff for every release. Verify very recent events against search.
12 · Comparison

GPT-5.6 Terra Pro vs other Openai models

ModelContextInput /1MOutput /1MAA indexReleased
GPT-5.6 Terra Pro1.05M$2$12n/a2026
GPT-6 Astra1.05M$10$5057Sep 2026
GPT-6 Astra Pro1.05M$10$50n/aSep 2026
GPT-5.6 Sol1.05M$4$20n/a2026
GPT-5.6 Sol Pro1.05M$4$20n/a2026
GPT-5.6 Terra1.05M$2$12322026
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 Pro questions, answered

GPT-5.6 Terra Pro is a reasoning model from Openai, released 9 July 2026. GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/gpt-5.6-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks.
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