As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/m/gpt-5-4/

# GPT-5.4

OpenAI, GPT-5 family. Status: legacy. Type: reasoning model. Released: 2026-03-05. Training cutoff: 2025-08.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| OpenAI API | `gpt-5.4` | https://api.openai.com/v1/responses | https://developers.openai.com/api/docs/models/gpt-5.4 |
| Azure OpenAI (Microsoft Foundry) | `gpt-5.4` |  | https://learn.microsoft.com/en-us/azure/foundry/foundry-models/concepts/models-sold-directly-by-azure |
| OpenRouter | `openai/gpt-5.4` |  | https://openrouter.ai/openai/gpt-5.4 |
| Web app |  |  | https://chatgpt.com |

## Pricing

- Input: $2.50 per 1M tokens
- Cached input: $0.25 per 1M tokens
- Output: $15 per 1M tokens
- Unit as published: per 1M tokens (USD), standard tier
- Note: prompts >272K input tokens billed 2x input / 1.5x output
- Source: https://developers.openai.com/api/docs/pricing
- Last checked: 2026-09-29

## Specs

- Input: text, image
- Output: text
- Context window: 1,050,000 tokens
- Max output: 128,000 tokens
- Open weights: no
- Licence: proprietary

## What it has not seen

- Published training cutoff: 2025-08 (August 2025).
- AI events after it on Post-Cutoff: 2,002 (461 major, 87 historic), as of 2026-11-13.
- Already missing at launch: 86.
- Briefings of the news since August 2025: https://postcutoff.com/briefings/cutoff-2025-08-s.md (short), https://postcutoff.com/briefings/cutoff-2025-08-m.md (medium), https://postcutoff.com/briefings/cutoff-2025-08.md (full).
- Its card, with five things it has never heard of: https://postcutoff.com/you/gpt-5-4/

## What stands out

- Tool search and computer use: Launched together with API tool search and computer-use support. Source: https://developers.openai.com/api/docs/changelog
- 1M context: 1.05M context window with 128K output; effort defaults to none. Source: https://developers.openai.com/api/docs/models/gpt-5.4

## Notes

Snapshot gpt-5.4-2026-03-05. Variants gpt-5.4-pro ($30/$180), gpt-5.4-mini ($0.75/$4.50), gpt-5.4-nano ($0.20/$1.25) are also on the pricing page and OpenRouter.

```bash
curl https://api.openai.com/v1/responses \
 -H "Authorization: Bearer $OPENAI_API_KEY" -H "Content-Type: application/json" \
 -d '{"model":"gpt-5.4","input":"Hello"}'
```

Sources:
- https://developers.openai.com/api/docs/models/gpt-5.4
- https://developers.openai.com/api/docs/pricing
- https://developers.openai.com/api/docs/changelog
- Models overview: https://developers.openai.com/api/docs/models

Model page: https://postcutoff.com/m/gpt-5-4/