400K tokens
Context window
OpenAI ChatGPT
GPT-5
Tool calling, structured output, agentic loops
128K tokens
Max output
$1.25
Input per 1M
$10
Output per 1M
late 2024
Knowledge cutoff
text, image, audio
Modalities
Last verified 20 May 2026 Report a correction
What it tends to refuse
Weapons, malware, explicit sexual content, medical and legal advice framed as professional guidance
Follows a JSON schema more reliably than anything else here. Pays more attention to the end of a long prompt than the start, so put binding rules last.
Standing rules for this model go in AGENTS.md, not in every message.
See the config files.
Written for ChatGPT
All 16- CheatsheetUniversal
Forcing an output format that holds
The phrasings that actually constrain output, and the ones people use that do not. Tested by asking for the same thing twenty times and counting the…
Tested on Claude Sonnet · May 2026
- CheatsheetChatGPT
ChatGPT commands and keyboard shortcuts
The commands and shortcuts that are not in the interface anywhere, collected in one table. Mostly keyboard, mostly undocumented.
Tested on GPT-5 · May 2026
Senior engineer who reads before changing
Turns the model into a colleague who answers the question you asked, touches only what you pointed at, and says out loud which parts it did not…
Tested on Claude Sonnet · May 2026
Editor who does not flatten your voice
Separates fixing what is wrong from rewriting what is fine, and only does the first unless you ask. Stops the slide into the same neutral register…
Tested on GPT-5 · May 2026
- ErrorChatGPT
429 Too Many Requests / Rate limit reached
You crossed a request or token limit for your tier. The fix is backoff with jitter and batching, not a shorter sleep, and the header tells you which…
Tested on GPT-5 · May 2026
- ErrorChatGPTGemini
This model's maximum context length is N tokens
The request is longer than the model can hold, counting your prompt, the whole conversation history and the space reserved for the answer. Usually it…
Tested on GPT-5 · May 2026