AI Model Watch
Models / OpenAI

GPT-5.6 Terra

GA

Balanced 'Terra' tier of the GPT-5.6 family — GPT-5.5-class quality at lower cost, positioned for everyday work. GA on the API + Codex 2026-07-09. Text+image input, text output. PRICE CORRECTED 2026-08-08: we published $2.50/$0.25/$15.00, which appears in no cell of OpenAI's pricing page; both first-party surfaces state $2.00/$0.20/$12.00 — developers.openai.com/api/docs/pricing (Standard tier) and the model page. Cache write $2.50/M. Prompts >272K input tokens are billed at 2x input / 1.5x output for the whole request (stated on the model page). Batch ~50% ($1.00/$0.10/$6.00).

GPT-5.6 Terra by OpenAI costs $2 per 1M input tokens and $12 per 1M output tokens ($4.50/1M blended), with a 1.1M (1.050.000-token) context window. It is generally available (GA), with a knowledge cutoff of 16 Feb 2026.

Last verified: 13 Aug 2026 · sourced from official provider documentation

Provider
OpenAI
Status
GA
Input price
$2 / 1M tokens
Output price
$12 / 1M tokens
Cached input
$0.2 / 1M tokens
Blended price
$4.50 / 1M tokens
Context window
1.050.000 tokens (1.1M)
Max output
128.000 tokens
Modality
text, image
Open weights
No — API only
Knowledge cutoff
2026-02-16
Released
9 Jul 2026
API string
gpt-5.6-terra

Source: OpenAI official documentation ↗

See also

Compare GPT-5.6 Terra head-to-head

GPT-5.6 Terra vs GPT-5.6 Cyber→

$4.50 vs $28.13 blended /M · same family

GPT-5.6 Terra vs GPT-5.6 Luna→

$4.50 vs $0.45 blended /M · same family

GPT-5.6 Terra vs GPT-5.6 Sol→

$4.50 vs $11.25 blended /M · same family

FAQ

GPT-5.6 Terra — questions & answers

How much does GPT-5.6 Terra cost?

GPT-5.6 Terra is priced at $2 per 1M input tokens and $12 per 1M output tokens ($4.50/1M blended at a 3:1 input-to-output ratio), with cached input at $0.2 per 1M tokens.

What is the context window of GPT-5.6 Terra?

GPT-5.6 Terra has a 1.050.000-token context window (1.1M), with up to 128.000 output tokens per request.

Is GPT-5.6 Terra deprecated?

No — GPT-5.6 Terra is generally available (GA) and not currently scheduled for deprecation or retirement in our tracker.

Does GPT-5.6 Terra support image or vision input?

Yes — GPT-5.6 Terra accepts image input. Listed modalities: text, image.

Can I self-host GPT-5.6 Terra?

No — GPT-5.6 Terra is proprietary. Its weights are not publicly released, so it is available only through OpenAI's API (or hosted partners), not for self-hosting.

What is the API model string for GPT-5.6 Terra?

The API model identifier for GPT-5.6 Terra is "gpt-5.6-terra" when calling OpenAI's API.

What is GPT-5.6 Terra's knowledge cutoff?

GPT-5.6 Terra's training knowledge cutoff is 16 Feb 2026.