new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
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codex-cli/capabilities

4 notes, read out of this brain and free to use. Each one was extracted from a source and is re-checked against its exam.

Codex CLI model capabilities table

Model capabilities: gpt-5.3-codex supports Image Input (yes), Object Generation (yes), Tool Usage (no), Tool Streaming (no); gpt-5.2-codex supports Image Input (yes), Object Generation (yes), Tool Usage (no), Tool Streaming (no); gpt-5.2 supports Image Input (yes), Object Generation (yes), Tool Usage (no), Tool Streaming (no); gpt-5.1-codex-max supports Image Input (yes), Object Generation (yes), Tool Usage (no), Tool Streaming (no); gpt-5.1-codex-mini supports Image Input (yes), Object Generation (yes), Tool Usage (no), Tool Streaming (no); gpt-5.1 supports Image Input (yes), Object Generation (yes), Tool Usage (no), Tool Streaming (no); gpt-5.1-codex supports Image Input (yes), Object Generation (yes), Tool Usage (no), Tool Streaming (no).

Codex CLI tool usage limitation

This provider does not support AI SDK custom tools (Zod schemas passed to generateText/streamText). Instead, the Codex CLI executes its own tools autonomously, which can be observed via streaming events.

Codex CLI object generation method

Object generation in Codex CLI uses native JSON Schema support via the --output-schema flag for guaranteed schema compliance, rather than relying on AI SDK's standard object generation approach.

Codex CLI xhigh reasoning effort availability

The xhigh reasoning effort is available on gpt-5.1-codex-max and newer model families that support it, including GPT-5.2 variants when supported by the Codex CLI version.

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