xAI announces Grok-1.5 — 128K-token context and improved reasoning
xAI has announced a new Grok model, “Grok-1.5.” Its headline feature is an expanded context length of up to 128,000 tokens — about 16 times that of the previous model. Reasoning performance on coding and math also improved significantly.
Details
- Context length: Supports up to 128,000 tokens, enabling responses that take longer documents and conversation history into account
- Benchmark results: Scored 50.6% on the MATH benchmark, 90% on GSM8K, and 74.1% on HumanEval
- Improved reasoning: Emphasized performance gains on coding- and math-related tasks in particular
- Availability: At the time of announcement, planned for a gradual rollout to X Premium+ subscribers
What happened next
The announcement of Grok-1.5 signaled xAI’s shift from a simple chat-oriented model toward prioritizing long context and reasoning performance. This direction carried through to Grok-2 that August and Grok-3 in February the following year, as xAI rapidly cycled through model generations in a short span of time.
Source https://x.ai/news/grok-1.5