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Amazon 8 Anthropic 31 Cohere 35 DeepSeek 5 Google 34 MiniMax 17 Mistral 53 Moonshot AI 18 OpenAI 106 Qwen 26 xAI 26 Xiaomi MiMo 4 Z.ai 22
xAI grok-4-1-fast-non-reasoning

Grok 4.1 Fast Non-Reasoning (xAI)

Retired

Yes — Grok 4.1 Fast Non-Reasoning is retired. xAI shut it down on May 15, 2026; API requests to it now fail. The recommended replacement is Grok 4.3.

The straight-through twin of Grok 4.1 Fast Reasoning, same weights and same 2M window with thinking turned off. Splitting one model into two ids by reasoning mode is exactly what grok-4.3's reasoning_effort parameter made unnecessary, and both halves went at once.

The facts

Provider xAI
Model id grok-4-1-fast-non-reasoning
Released —
Deprecated date not published
Shutdown May 15, 2026 · 80 days ago
Status Retired
Last verified August 3, 2026

What to use instead

xAI Grok 4.3 grok-4.3 Provider-recommended Active

Maps to grok-4.3 with reasoning effort "none". Set that explicitly rather than relying on the redirect, or a later change to the default leaves you paying for thinking tokens you never asked for.

What parameters grok-4.3 accepts on modelparams.dev

Change the id

In most cases the migration is one string. Check the parameter differences before you ship — newer models drop older sampling knobs more often than they add them. 

- "model": "grok-4-1-fast-non-reasoning"
+ "model": "grok-4.3"

Frequently asked questions

When did xAI Grok 4.1 Fast Non-Reasoning shut down?
xAI Grok 4.1 Fast Non-Reasoning shut down on May 15, 2026. API requests to it fail from that date onward.
What replaces xAI Grok 4.1 Fast Non-Reasoning?
xAI recommends Grok 4.3 (`grok-4.3`) as the replacement for xAI Grok 4.1 Fast Non-Reasoning. Maps to grok-4.3 with reasoning effort "none". Set that explicitly rather than relying on the redirect, or a later change to the default leaves you paying for thinking tokens you never asked for.
Is xAI Grok 4.1 Fast Non-Reasoning still available?
No. xAI Grok 4.1 Fast Non-Reasoning is retired and no longer served — it was shut down on May 15, 2026. Calls to it return an error.
How do I migrate from xAI Grok 4.1 Fast Non-Reasoning to grok-4.3?
Swap the model id in your API call: replace "grok-4-1-fast-non-reasoning" with "grok-4.3". Maps to grok-4.3 with reasoning effort "none". Set that explicitly rather than relying on the redirect, or a later change to the default leaves you paying for thinking tokens you never asked for.

Sources

Found something wrong? The data is one YAML file — edit it on GitHub.

This page, for machines

JSON Markdown Badge JSON

Drop the badge in a README so it turns red the day this model is retired:

[![grok-4-1-fast-non-reasoning](https://img.shields.io/endpoint?url=https://modeldeprecations.dev/badge/xai/grok-4-1-fast-non-reasoning.json)](https://modeldeprecations.dev/xai/grok-4-1-fast-non-reasoning)

Other xAI models

All xAI deprecations →

How to use this site

The full guide, in Markdown. Copy it and hand it to a coding agent verbatim.

# How to use modeldeprecations.dev

[modeldeprecations.dev](https://modeldeprecations.dev) answers one question per model: is it deprecated,
when does it shut down, and what replaces it. Every date on the site is cited to the
provider's own documentation, with the date we last checked it.

Three lifecycle states are used, matching the providers' own vocabulary:

- **active** — still supported, no deprecation announced.
- **deprecated** — the provider has announced it is going away. It still answers requests.
- **retired** — API access is gone. Requests fail.

A model can be active *and* carry a shutdown date: Anthropic publishes a
"not sooner than" date and Google publishes an earliest shutdown date for models
that are current and fully supported. Those are reported as scheduled shutdowns,
not deprecations, because that is what the provider actually committed to.

## Check one model

```bash
curl https://modeldeprecations.dev/api/v1/models/openai/gpt-4-32k.json
```

Or fetch the page as Markdown, which includes the answer, the dates and the sources:

```bash
curl https://modeldeprecations.dev/openai/gpt-4-32k.md
```

## Full catalog

```bash
curl https://modeldeprecations.dev/api/v1/models.json
```

Ids are `provider/model`. Dated snapshots (`gpt-4-32k-0613`) are listed as aliases of
their canonical entry rather than as separate records.

Each entry carries `computed_status`, the lifecycle state recomputed against the build
date — so a model whose shutdown has passed reads `retired` without anyone editing data.

## Badges

A shields.io endpoint per model, for READMEs that should go red when a model dies:

```
https://img.shields.io/endpoint?url=https://modeldeprecations.dev/badge/openai/gpt-4-32k.json
```

## Calendar and changelog

- Subscribe to every shutdown date: https://modeldeprecations.dev/calendar.ics
- Changelog RSS: https://modeldeprecations.dev/changelog.xml

## JSON Schema

```bash
curl https://modeldeprecations.dev/api/v1/schema.json
```

## Contribute

Data lives in YAML under `models/{provider}/{model}.yaml` in the
[GitHub repo](https://github.com/mnfst/modeldeprecations.dev). Every lifecycle date needs a source URL; CI rejects a
date without one. Open a PR.

## For agents

- Machine-readable overview: https://modeldeprecations.dev/llms.txt
- This guide plus every model inline: https://modeldeprecations.dev/llms-full.txt
- Any page also exists as Markdown: append `.md` to a model URL.
- In a browser, this site registers a **WebMCP** tool on `navigator.modelContext`:
  `check_model_deprecation`, `list_shutdowns`, `find_replacement`, and `get_usage_guide`.
- Parameters each model accepts are catalogued on the sibling site, https://modelparams.dev.