Breaking

OpenAI Fixes GPT-6 Sol and Luna Bug That Hurt Image Understanding

September 27, 2026 at 12:49 EDT

Foundation Models
AI Agents
Software Dev & Coding

OpenAI has fixed an image-encoding bug that degraded image understanding in GPT-6 Sol and GPT-6 Luna, affecting visual tasks in the API and Codex, including computer use. The Sept. 25 API update says teams using image inputs should rerun evaluations and retry workflows affected by the issue.

Sep. 25, 2026 · OpenAI

Vision bug fixed in GPT-6 Sol and Luna

An image-encoding issue had degraded visual tasks in the API and Codex, including computer use. Teams using image inputs are being directed to rerun evaluations and retry affected workflows.

GPT-6 models affected

1.05M

Token context window

128K

Maximum output tokens

272K

Long-prompt pricing threshold

Cost context: Sol input price was halved

Vertical blocks show dollars per 1M input tokens, before and after the GPT-6 Sol release.

GPT-5.6 Sol

GPT-6 Sol

Where the fix lands

Image inputScreenshots, documents, charts, UI state

→

Encoding fixImage pathway repaired

→

Rerun evalsRetry affected workflows

What improves

Visual tasks in the API and Codex should perform better after the image-encoding repair, especially screenshot-driven computer-use loops.

What remains open

No post-fix benchmark, incident window, or detailed root cause was published beyond the image-encoding bug.

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