GPT-6.1 Sol Guide (2026)

What it is, what it costs, how it benchmarks, and how to use it. Last updated: September 30, 2026.

Released September 29–30, 2026: GPT-6.1 Sol is OpenAI's upgrade to GPT-6 Sol, advertised as near-Astra intelligence for roughly a fifth of Astra's price. Source: OpenAI announcement.

Price at a glance

GPT-6 Astra in$10 / 1M

GPT-6.1 Sol in$2 / 1M

GPT-6 Luna in$0.10 / 1M

Input-token price, bar scaled to Astra. Full table: pricing.

Benchmark highlights

Coding (DeepSWE v1.1): matches Astra at ~1/5 the cost
Documents (GDP.pdf): beats Opus 5.5 at <½ cost
Computer use (OSWorld 2.0): +7pp over GPT-6 Sol

Vendor-claimed numbers, explained: benchmarks.

The 30-second version

Item	Fact (per OpenAI, Sept 2026)
What	Upgrade to GPT-6 Sol; API model id `gpt-6.1-sol`
Price	$2 / 1M input · $10 / 1M output · $0.10 / 1M cached input
Strengths	Agentic coding, computer use, professional work, factuality
Where	ChatGPT Work & Codex (paid tiers) + OpenAI API; not in free Chat

All figures below are OpenAI's stated numbers from the launch announcement, not independent tests. See benchmarks for the full table.

Start here

GPT-6.1 Sol pricing — full price table vs Astra and Luna
GPT-6.1 Sol benchmarks — DeepSWE, GDP.pdf, AutomationBench, OSWorld, Terminal-Bench, factuality
How to access GPT-6.1 Sol — ChatGPT tiers, API, OpenRouter
GPT-6.1 Sol vs GPT-6 Sol vs Luna — which one to pick
FAQ — free? release date? system card?