Breaking

OpenAI Launches GPT-6.1 Sol With Near-Astra Performance at Lower Token Prices

September 29, 2026 at 14:53 EDT

Foundation Models
AI Agents
Software Dev & Coding

OpenAI introduced GPT-6.1 Sol on September 29, 2026, positioning it as an upgrade to GPT-6 Sol that brings near-GPT-6 Astra performance to agentic coding, computer use and professional work at much lower token prices. The model is available in the API as gpt-6.1-sol, in ChatGPT Work and Codex for Plus, Pro, Business, Enterprise and Edu users, and has also appeared on Design Arena.

September 29, 2026 · OpenAI

GPT-6.1 Sol lowers the price of capable agents

The new Sol upgrade aims for near-Astra performance in coding, computer use and professional work while keeping standard token prices at one-fifth of Astra.

Standard token-price scale

GPT-6.1 Sol
$2 input / $10 output

GPT-6 Astra
$10 input / $50 output

One Sol block equals one-fifth of Astra's standard input and output token prices.

$0.10

Cached input per 1M tokens

1.05M

Context-window tokens

128K

Maximum output tokens

Planned Codex Ultrafast speedup

Why cached input matters

Load project context

Large codebases and documents enter the model window.

→

Reuse repeated context

Follow-up agent calls can hit the cache.

→

Run more iterations

Lower repeat-input cost supports longer coding and work sessions.

Where it helps

Developers gain a cheaper default for repeated agentic coding, computer-use workflows and document-heavy professional tasks.

Where to watch

Astra still leads the hardest scientific tasks, GPT-6.1 Sol is not yet in Chat, and safety routing remains important.

Continue reading

The rest of this article is for AI News Blitz readers. Choose an option below to keep reading.