GPT-5.6 Terra specs, prices, where it runs and its benchmark standing

Name: GPT-5.6 Terra
Author: OpenAI

closed weights · #35 overall, podium score 2.1 · top 10 on 1 of 9 · released Jul 9, 2026

Provider: OpenAI
Release date: Jul 9, 2026; Boards
Parameters: Not disclosed by OpenAI
Modalities: Text, Image, Files to Text; OpenRouter
License: Proprietary; LMArena
Context window: 1.05M tokens; Pricing
Pricing: $2 in / $12 out per 1M tokens; All prices
Hosting: 7 priced API routes · Azure OpenAI (28 regions) · OpenRouter; Pricing Regions
Weights: Closed weights
Benchmarks: 9 boards captured, #35 overall

Rank	Board	Category	Score	Of
8	SWE-Bench ProCoding · as “GPT-5.6 Terra (Codex) xhigh”	Coding	86.3%	18
13	Document ArenaVision · as “GPT-5.6 Terra (xHigh)”	Vision	1,474	40
14	Epoch ECIReasoning · as “GPT-5.6 Terra”	Reasoning	160.9	100
15	ARC-AGI-2Reasoning · as “GPT-5.6 Terra (Max)”	Reasoning	83.9%	92
19	GPQA DiamondReasoning · as “gpt-5.6-terra_max”	Reasoning	93.3%	100
20	LiveBenchReasoning · as “gpt-5.6-terra-max”	Reasoning	77.9%	64
30	Vision ArenaVision · as “GPT-5.6 Terra (xHigh)”	Vision	1,267	85
43	Text ArenaChat · as “GPT-5.6 Terra (xHigh)”	Chat	1,468	84
50	WebDev ArenaCoding · as “GPT-5.6 Terra (xHigh, Codex Harness)”	Coding	1,521	82