GPT-5.6 Terra API pricing | The Ground Truth

Capability scores

Epoch AI

Maths3 of 4 benchmarks85

Science and knowledge2 of 2 benchmarks67

CodingNot tested by Epoch

Reasoning and puzzles2 of 2 benchmarks36

Agents and long tasks1 of 3 benchmarks35

Each bar is this model's score in that area. The white tick marks the best score any model Epoch has tested reaches there.

Epoch Capabilities Index

160

Range 158 to 163 · #15 of 271 models Epoch has scored

Maths

85average of 3 of 4 Epoch results

FrontierMath (tiers 1 to 3) (max)86%

FrontierMath (tier 4) (max)71%

OTIS Mock AIME (max)99.7%

Science and knowledge

67average of 2 of 2 Epoch results

GPQA Diamond (max)93%

SimpleQA Verified (max)43%

Reasoning and puzzles

36average of 2 of 2 Epoch results

Chess puzzles (max)47%

Mystery game puzzles (max)35%

Agents and long tasks

35average of 1 of 3 Epoch results

Furniture assembly (max)54%

The index combines many benchmarks into one general-capability score; the range is how sure Epoch is of the number. Each area score is this site's average of the model's Epoch results in that area, where 0 is what guessing would score and 100 is perfect. Compare every model, and value for money →

Source: Epoch AI, Capabilities & benchmarking (licensed CC BY 4.0). Data refreshed 2 November 2026. These are Epoch's own tests; other benchmark sites can rank models differently.

Cheaper models that come close

Our working on Epoch's index

Models within 5 points of GPT-5.6 Terra on Epoch's Capabilities Index that cost less, comparing a typical chat mix (three parts input to one part output). A few points of index is a small difference and says nothing about your task: a place to start testing, not a verdict. Capability against price for every model.

Specification

USD per million tokens

Provider: OpenAI
Model id: openai/gpt-5.6-terra
Input: $2.00
Output: $12
Cached input: $0.20
Context window: 1.1M tokens
Maximum output: 128K tokens
Takes: file, image, text
Returns: text
Tool use: Yes
Reasoning: Yes
Released: 9 Jul 2026
First tracked: 17 Sept 2026

At $2.00 per million input tokens, GPT-5.6 Terra is dearer than 264 of the 340 models on the price list.

Price changes

Tracked since 17 Sept 2026

No price change has been recorded since tracking began on 17 Sept 2026. Prices are checked every six hours, and any change is listed here and on model changes.

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Other entries for this model

GPT-5.6 Terra (batch) $1.00

GPT-5.6 Terra API pricing.