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Models2026-07-20 · source-backed
Release notes also cover ChatGPT Work, powered by GPT-5.6, which pulls context from a team's connected tools. The character limit is the quietly significant one. 1,500 characters is a summary. 5,000 is roughly where a persistent instruction block can carry real style specifications and hard constraints rather than gestures at them. If you've been trimming your custom instructions to fit, go rewrite them at full length. And then read the CLAUDE.md length finding below before you fill all 5,000.
Each link below shares sources, entities, or timing with this story.
Claude competes with ChatGPT / Shared entities / Same source / Shared topic / Earlier coverage
Linked by a graph relationship (Claude competes with ChatGPT); both cover ChatGPT, GPT, OpenAI; cite the same source (Release notes).
OpenAI released Codex / Shared entities / Same source / Shared topic / Earlier coverage / Downstream implication
Linked by a graph relationship (OpenAI released Codex); both cover GPT, OpenAI; cite the same source (Release notes).
Cursor supports Claude / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Cursor supports Claude); both cover ChatGPT, Claude, OpenAI; overlapping topics (block, chatgpt, claude).
Claude competes with ChatGPT / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Claude competes with ChatGPT); both cover ChatGPT, GPT, OpenAI; overlapping topics (chatgpt, context).
Anthropic released Claude / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Anthropic released Claude); both cover ChatGPT, CLAUDE, OpenAI; overlapping topics (chatgpt, claude).
ChatGPT built by OpenAI / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (ChatGPT built by OpenAI); both cover GPT, OpenAI; overlapping topics (chatgpt, claude, connected, context).
Claude competes with ChatGPT / Shared entities / Earlier coverage
Linked by a graph relationship (Claude competes with ChatGPT); both cover ChatGPT, Claude, GPT, OpenAI; earlier ChatGPT coverage from 2026-06-21.
Anthropic released Claude / Shared entities / Shared topic
Linked by a graph relationship (Anthropic released Claude); both cover CLAUDE, GPT, OpenAI; overlapping topics (claude, context, instruction).