Grok 3
xAI
xAI's first dedicated reasoning model (February 2025), trained on the Colossus supercluster and reported to outperform GPT-4o on academic benchmarks such as AIME 2025 and GPQA. Grok 3 serves a 131K-token context window via the xAI API and introduced Think and Big Brain reasoning modes.
Strengths
- xAI's first dedicated reasoning model
- Reported to outperform GPT-4o on AIME 2025 and GPQA
- Think and Big Brain modes for deeper reasoning
- Trained on the Colossus supercluster at scale
Caveats
- Documented 131K API context despite '1M' launch marketing
- Superseded by Grok 4 and Grok 4.3
- $3/$15 pricing higher than newer xAI flagships
- Vendor
- xAI
- Context Window
- 131,072 tokens
- License
- Proprietary
- Release Date
- 2025-02-17
- Modalities
- text
| Benchmark | Score | Max |
|---|---|---|
| livebench_language | 51.3 | 100.0 |
| livebench_coding | 54.3 | 100.0 |
Capabilities
Vision
Audio
Video
Tool Use
Resources
Pricing
$3 per 1M input tokens, $15 per 1M output tokens via the xAI API. Despite '1M' launch marketing, the documented API context ceiling is 131K.