AI Model Release Tracker

Grok Code Fast 1

Released

Grok Code Fast 1 is an AI model released by SpaceXSI on Thursday, Aug 28 2025, 5 days after Grok 2.5. It has a 256k token context windowHow much information the model can work with in one request, measured in tokens — pieces of words or other data. This includes your question, attachments, conversation and reply. Limits can vary by model variant and provider.. Benchmark results (shown below) cover SWE-Bench Verified.

API pricing

Under 200K input tokens
InputWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it.
$1.00
Cached inputA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again.
$0.20
OutputWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one.
$2.00
At least 200K input tokens
InputWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it.
$2.00
Cached inputA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again.
$0.40
OutputWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one.
$4.00
  • Reasoning or thinking is supported.
USD per 1M tokensEvery price here is for one million tokens. A token is roughly three-quarters of a word, so a million tokens is about 750,000 words of text.Model mappingVerified October 19, 2026Read from docs.x.ai. Click the check to open the source.

Benchmarks

SWE-Bench VerifiedCoding — 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.via BenchLM
70.8%
#40 of 70

Source: BenchLM, retrieved 31 August 2026. Other sources are identified on the linked benchmark pages.

Compare Grok Code Fast 1 with

Grok Code Fast 1

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About

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.

Frequently asked questions

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

All SpaceXSI releases

21 tracked

2023

1 release
Grok‑1
Nov 3 2023