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-4o/

# GPT-4o

OpenAI. Status: deprecated. Type: multimodal model. Released: 2024-05-13. Training cutoff: 2023-10.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| OpenAI API | `gpt-4o` | https://api.openai.com/v1/chat/completions | https://developers.openai.com/api/docs/models/gpt-4o |
| Azure OpenAI (Microsoft Foundry) | `gpt-4o` |  | https://learn.microsoft.com/en-us/azure/foundry/foundry-models/concepts/models-sold-directly-by-azure |
| OpenRouter | `openai/gpt-4o` |  | https://openrouter.ai/openai/gpt-4o |

## Pricing

- Input: $2.50 per 1M tokens
- Cached input: $1.25 per 1M tokens
- Output: $10 per 1M tokens
- Unit as published: per 1M tokens (USD), standard tier
- Source: https://developers.openai.com/api/docs/pricing
- Last checked: 2026-10-15

## Specs

- Input: text, image
- Output: text
- Context window: 128,000 tokens
- Max output: 16,384 tokens
- Open weights: no
- Licence: proprietary

## What it has not seen

- Published training cutoff: 2023-10 (October 2023).
- AI events after it on Post-Cutoff: 2,086 (504 major, 98 historic), as of 2026-11-13.
- Already missing at launch: 19.
- Briefings of the news since October 2023: https://postcutoff.com/briefings/cutoff-2023-10-s.md (short), https://postcutoff.com/briefings/cutoff-2023-10-m.md (medium), https://postcutoff.com/briefings/cutoff-2023-10.md (full).
- GPT-4o is named in one of our documented cases of cutoff blindness (case 005). https://postcutoff.com/why/005-chatgpt-keeps-calling-biden-current-president/

## What stands out

- Omni model: Natively multimodal "o" model; basis of the gpt-4o audio/realtime/transcribe/TTS variants. Source: https://developers.openai.com/api/docs/models/gpt-4o
- Fine-tunable: Supports fine-tuning via v1/fine-tuning. Source: https://developers.openai.com/api/docs/models/gpt-4o

## Notes

Snapshots gpt-4o-2024-11-20, -2024-08-06, -2024-05-13 (the last deprecated, shutdown Oct 23 2026). chatgpt-4o-latest shut down Feb 17 2026. On 2026-10-14 OpenAI deprecated gpt-4o-2024-08-06, gpt-4o-2024-11-20 and gpt-4o-mini-2024-07-18 (shutdown Jan 14 2027, replacement gpt-6-luna; fine-tunes follow their base model). gpt-4o-mini was $0.15/$0.60.

```bash
curl https://api.openai.com/v1/responses \
 -H "Authorization: Bearer $OPENAI_API_KEY" -H "Content-Type: application/json" \
 -d '{"model":"gpt-4o","input":"Hello"}'
```

Sources:
- https://developers.openai.com/api/docs/models/gpt-4o
- https://developers.openai.com/api/docs/pricing
- https://developers.openai.com/api/docs/deprecations
- Models overview: https://developers.openai.com/api/docs/models

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