# Grok Code Fast 1

Grok Code Fast 1 is an AI model released by SpaceXSI on Aug 28 2025. It has a 256k context window. Tracked results include 70.8% on SWE-Bench Verified.

## Facts

| Field | Value |
| --- | --- |
| Model | Grok Code Fast 1 |
| Developer | SpaceXSI |
| Release date | Thursday, Aug 28 2025 |
| Licensing | Closed |
| Context window | 256k |

## API pricing

All rates in USD per 1,000,000 tokens, pay-as-you-go.

| Tier | Input | Cached input | Output |
| --- | --- | --- | --- |
| Under 200K input tokens | $1.00 | $0.20 | $2.00 |
| At least 200K input tokens | $2.00 | $0.40 | $4.00 |

Verified October 19, 2026 against the first-party source: https://docs.x.ai/developers/pricing

## Tracked benchmark scores

| Benchmark | Score | Source | What it measures |
| --- | --- | --- | --- |
| SWE-Bench Verified | 70.8% | [BenchLM](https://benchlm.ai), retrieved 2026-08-31 | Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. |

## About Grok Code Fast 1

Grok Code Fast 1 launched on August 28, 2025 as xAI's model built specifically for agentic programming. The company described a new architecture trained on programming material and post-trained on real coding tasks. Its intended environment included search, terminal commands and file editing, so the focus extended beyond answering isolated code questions.

The launch partnered with coding products including Cursor, GitHub Copilot and Cline. xAI reported 70.8% on SWE-bench Verified using its own internal harness, a setup that should be kept with the score when comparing systems. The model emphasized short interaction loops and economical serving, making response speed part of the development experience as an agent repeatedly inspected, changed and tested a codebase.

## Questions and answers

### When was Grok Code Fast 1 released?

Grok Code Fast 1 was released by SpaceXSI on Thursday, Aug 28 2025.

### Who made Grok Code Fast 1?

Grok Code Fast 1 was built by SpaceXSI. Elon Musk's AI company building the Grok series of models. Founded in 2023 as xAI, merged into SpaceX as SpaceXAI in 2026 and renamed SpaceXSI (SpaceX Super Intelligence) that October. Cursor (Anysphere) and its Composer coding models were acquired in 2026 and are tracked here.

### How much does Grok Code Fast 1 cost?

Grok Code Fast 1 costs $1.00 per million input tokens and $2.00 per million output tokens through the SpaceXSI API. Cached input is $0.20 per million tokens. Those are the rates for the “Under 200K input tokens” tier; 1 other pricing tier is published for this model. Rates are pay-as-you-go API prices verified against SpaceXSI's published pricing on October 19, 2026.

### What benchmark scores did Grok Code Fast 1 get?

Grok Code Fast 1 reports 1 tracked benchmark score — SWE-Bench Verified: 70.8%. Tracked scores may come from lab reports or independent benchmarks; source details accompany the benchmark data.

### What is the context window of Grok Code Fast 1?

Grok Code Fast 1 has a context window of 256k. Providers may specify separate input and output token limits.

### Is Grok Code Fast 1 open source?

No. Grok Code Fast 1 is a closed model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

### What came before and after Grok Code Fast 1?

SpaceXSI's previous tracked release was Grok 2.5 on Aug 23 2025, 5 days earlier. It was followed by Grok 4 Fast on Sep 19 2025.


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Canonical page: https://aireleasetracker.com/model/xai/grok-code-fast-1
Site index: https://aireleasetracker.com/llms.txt
Source: AI Release Tracker (https://aireleasetracker.com). Most benchmark scores come from lab launch material; gathered results identify the leaderboard that published them.