Model

GPT-5.6

CLOSED

OpenAI · GPT-5.6 family · released Jul 9, 2026

Sol tier billed as OpenAI's best coding model yet (Terminal-Bench 2.1 SOTA); limited-preview June 26 under US govt review, GA July 9, 2026.

ReasoningCodingVisionFunction callingTool useAgentic

3073.2

Elo · rank #1

Parameters

Undisclosed

Active params

—

Context

1.05M tokens

Architecture

Undisclosed architecture (presumed dense transformer); three durable capability tiers Sol/Terra/Luna (this entry reflects flagship Sol)

License

Proprietary

Languages

—

API price (in/out)

$5 / $30

Modalities

text · vision

Benchmark results

Bar shows position within the tracked field; marker = field best

Agents' Last ExamAgents52.7%#1

best: this model · 52.7%

ARC-AGI-1Reasoning96.5%#1

best: this model · 96.5%

ARC-AGI-2Reasoning92.5%#1

best: this model · 92.5%

BrowseCompAgents90.4%#2

best: Kimi K3 · 91.2%

CyberGymCoding84.5%#1

best: this model · 84.5%

FrontierMath (Tiers 1-3)Math89.0%#1

best: this model · 89.0%

FrontierMath (Tier 4)Math83.0%#1

best: this model · 83.0%

GDPval-AAAgents1747.8#4

best: Claude Fable 5 · 1932

GPQA DiamondReasoning94.6%#1

best: this model · 94.6%

Humanity's Last ExamReasoning47.2%#9

best: Claude Sonnet 5 · 57.4%

SWE-bench ProCoding64.6%#4

best: Claude Fable 5 · 80.0%

Terminal-Bench 2.0Coding88.8%#1

best: this model · 88.8%

Run it locally

Closed weights — available via API only. No local deployment.

Input / M tok

Output / M tok

$30

GPT-5.6 family

Elo progression across releases

GPT-5.6Jul 20263073.2

Resources

DOCSdevelopers.openai.com/api/docs/models/gpt-5.6-sol APIAvailable via OpenAI API

API price $5/$30 · each benchmark row carries its own source badge (see methodology)