Agentic Chat (Claude Sonnet 4.5) vs Grok Code Fast 1
Both have similar output pricing, while Grok Code Fast 1 offers a larger context window. Choose Agentic Chat (Claude Sonnet 4.5) or Grok Code Fast 1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Agentic Chat (Claude Sonnet 4.5) | Grok Code Fast 1 |
|---|---|---|
| Provider | GitLab Duo | OpenCode |
| Input / 1M tokens | $0.00 | $0.00 |
| Output / 1M tokens | $0.00 | $0.00 |
| Context window | 200K | 256K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Jan 2026 | Aug 2025 |
| LMArena WebDev Elo score | — | 1166 |
FAQ
Is Agentic Chat (Claude Sonnet 4.5) or Grok Code Fast 1 cheaper?
Agentic Chat (Claude Sonnet 4.5) and Grok Code Fast 1 have comparable output pricing.
Which has the larger context window, Agentic Chat (Claude Sonnet 4.5) or Grok Code Fast 1?
Grok Code Fast 1 has the larger context window (256K tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.