MODELS
Grok 4
xAI's flagship reasoning model with a 256K context and live X integration.
Specs
- Context window
- 256,000
- Max output
- 16,384
- Modalities
- text, image
- Tool use
- ✓
- Vision
- ✓
- Streaming
- ✓
- License
- proprietary
- Released
- 2025-09-01
Pricing
- Input / 1M
- $5.00
- Output / 1M
- $15.00
- Cached input / 1M
- $0.50
Cost estimate
Grok 4 is xAI's flagship model, aimed at heavy reasoning, coding, and agentic tool use. It handles text and images with a 256K context window and 16K max output, supports streaming and tool calling, and uniquely taps into live data from X. Pricing sits at $5/M input and $15/M output — the same ballpark as Claude Sonnet and GPT-5, well above Gemini 2.5 Pro on input.
Editor's verdict
Pick Grok 4 when you actually need live X/Twitter data in the loop or want xAI's less-filtered style — that's its real moat. For pure coding or long-doc reasoning, Claude Sonnet 4 and GPT-5 are safer bets with more mature tooling and ecosystem. The 16K output cap is tight for long-form generation, and proprietary licensing plus xAI's shorter track record on safety and reliability are real trade-offs.
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Last updated: 2026-04-29