Retired May 2026
Grok 3
xAI's flagship non-reasoning model, released February 2025 and trained on the Colossus cluster, with strengths in math, science and coding.
Key Specifications
- Context window
- 131K tokens
- Knowledge cutoff
- Released
- Inputs
- Text
- Capabilities Show details
- Function calling Connect to external tools, APIs, and systems. Structured output Return responses in structured formats like JSON.
Frequently Asked Questions
What is Grok 3 good for?
Text-only math, science and coding without a reasoning step. It was xAI's flagship non-reasoning model from February 2025 until its retirement.
When is Grok 3 not a good fit?
Any new work: xAI retired it in May 2026, and its migration guide points to Grok 4.3 with reasoning effort set to none. Text only, with no built-in web search or code execution.
How does Grok 3 compare with Grok 4?
xAI says Grok 4 goes beyond Grok 3 by running reinforcement learning at pretraining scale on its Colossus cluster, widening the training data from mostly math and coding to many more domains, and training the model to use tools natively, picking its own web and X searches. Grok 3 came out 5 months earlier, has a smaller context (131K against 256K tokens) and takes no image input, which Grok 4 does.
Can I self-host Grok 3?
No. xAI does not publish the weights; Grok 3 is available only through hosted APIs.
More from xAI
| Model | Context | Input /1M | Output /1M |
|---|---|---|---|
|
Grok 4.5
|
500K | $2.00 | $6.00 |
|
Grok 4.6
|
500K | $2.00 | $6.00 |
|
Grok 4.1 Fast (Non-Reasoning)
|
2M | ||
|
Grok 4.1 Fast (Reasoning)
|
2M | ||
|
Grok 4
|
256K | ||
|
Grok 3 Mini
|
131K | ||
|
Grok 4 Fast (Non-Reasoning)
|
2M | ||
|
Grok 4 Fast (Reasoning)
|
2M | ||