# Grok 4.5: API availability

Grok 4.5: API availability. First seen 11 Sep 2026 Catalogues list a 500,000 tokens context window. 7 evidence links.

- Kind: Sighting
- Developer: xAI
- Confidence: Supported
- First seen: 2026-09-11T21:39:38.120Z
- Model: [Grok 4.5](https://alexgetman.com/models/xai/grok-4-5/)
- Canonical: https://alexgetman.com/signals/2026/09/11/grok-4-5-high/
- Input · USD / 1M tokens: $2.00 (Input ≤ 199,999 tokens); $4.00 (Input > 199,999 tokens)
- Output · USD / 1M tokens: $6.00 (Input ≤ 199,999 tokens); $12.00 (Input > 199,999 tokens)
- Cached input · USD / 1M tokens: $0.30 (Input ≤ 199,999 tokens); $0.60 (Input > 199,999 tokens)

## Evidence links

- [Arena · leaderboards](https://docs.x.ai/developers/models/grok-4.5)
- [VoxelBench · leaderboard](https://voxelbench.ai/leaderboard)
- [OpenCode · discovery](https://opencode.ai/data/xai/grok-4-5)
- [Artificial Analysis · benchmarks](https://artificialanalysis.ai/models)
- [xAI · release notes](https://docs.x.ai/developers/release-notes#grok-45)
- [models.dev · catalogue](https://models.dev/#grok-4-5)
- [models.dev · catalogue](https://models.dev/#grok-4.5)