Benchmark Coding Agents Terra 5.6 Model Routing

GPT-5.6 Terra

GPT-5.6 model that balances intelligence and cost

GPT-5.6 Terra is a specific OpenAI AI model release referenced for Codex and API use, including lower-cost coding and reasoning workloads.

Pricing

Official site · Nov 1, 2026, 6:28 AM

Input / 1M

$2.00

Output / 1M

$12.00

Cached input / 1M

$0.20

Prompts with more than 272K input tokens are priced at 2x input and 1.5x output for the full request. Cache writes are billed at 1.25x uncached input token rate.

OpenAI's official model documentation identifies GPT-5.6 Terra as accepting text and image input, and states token-based pricing: $2 per 1M input tokens, $0.20 per 1M cached input tokens, and $12 per 1M output tokens. Requests over 272K input tokens have a stated surcharge.

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Model Intelligence

Arena ranking

Benchmarkable

Yes

Model level

release

Intelligence Index

32.3

GPQA

0.93

HLE

0.43

SciCode

0.55

IFBench

0.71

LCR

0.83

TerminalBench Hard

0.58

TAU2

0.86

Recent stories

1 linked story

newsPRIMARY2026-07-17

Terra 5.6 high cuts Clawsweeper GitHub review time by ~40%, Steipete says

Steipete said he moved the Clawsweeper GitHub review bot to 5.6 Terra high and saw about 40% faster reviews at lower cost with little quality change. A follow-up framed the result as a warning that general model benchmarks may not predict issue-review performance.