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-4-1/

# GPT-4.1

OpenAI. Status: deprecated. Type: language model. Released: 2025-04-14. Training cutoff: 2024-06.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| OpenAI API | `gpt-4.1` | https://api.openai.com/v1/chat/completions | https://developers.openai.com/api/docs/models/gpt-4.1 |
| Azure OpenAI (Microsoft Foundry) | `gpt-4.1` |  | https://learn.microsoft.com/en-us/azure/foundry/foundry-models/concepts/models-sold-directly-by-azure |
| OpenRouter | `openai/gpt-4.1` |  | https://openrouter.ai/openai/gpt-4.1 |

## Pricing

- Input: $2 per 1M tokens
- Cached input: $0.50 per 1M tokens
- Output: $8 per 1M tokens
- Unit as published: per 1M tokens (USD), standard tier
- Source: https://developers.openai.com/api/docs/pricing
- Last checked: 2026-10-24

## Specs

- Input: text, image
- Output: text
- Context window: 1,047,576 tokens
- Max output: 32,768 tokens
- Open weights: no
- Licence: proprietary

## What it has not seen

- Published training cutoff: 2024-06 (June 2024).
- AI events after it on Post-Cutoff: 2,060 (490 major, 98 historic), as of 2026-11-13.
- Already missing at launch: 34.
- Briefings of the news since June 2024: https://postcutoff.com/briefings/cutoff-2024-06-s.md (short), https://postcutoff.com/briefings/cutoff-2024-06-m.md (medium), https://postcutoff.com/briefings/cutoff-2024-06.md (full).

## What stands out

- 1M-token non-reasoning model: ~1M-token context without reasoning tokens; strong instruction following and tool calling. Source: https://developers.openai.com/api/docs/models/gpt-4.1
- Fine-tunable: Supports fine-tuning, unlike the GPT-5.x models. Source: https://developers.openai.com/api/docs/models/gpt-4.1

## Notes

Snapshot gpt-4.1-2025-04-14. gpt-4.1-nano was shut down on Oct 23 2026 (deprecations page, checked 2026-10-24; replacement gpt-5.6-luna). On 2026-10-14 OpenAI deprecated gpt-4.1-2025-04-14 and gpt-4.1-mini-2025-04-14 (gpt-4.1-mini was $0.40/$1.60): shutdown Jan 14 2027, replacement gpt-6-luna; fine-tunes follow their base model.

```bash
curl https://api.openai.com/v1/responses \
 -H "Authorization: Bearer $OPENAI_API_KEY" -H "Content-Type: application/json" \
 -d '{"model":"gpt-4.1","input":"Hello"}'
```

Sources:
- https://developers.openai.com/api/docs/models/gpt-4.1
- 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-4-1/