Agentic Chat (Claude Sonnet 5.5) vs Grok Code Fast 1
Both have similar output pricing, while Agentic Chat (Claude Sonnet 5.5) offers a larger context window. Choose Agentic Chat (Claude Sonnet 5.5) 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 5.5) | Grok Code Fast 1 |
|---|---|---|
| Provider | GitLab Duo | OpenCode |
| Input / 1M tokens | $0.00 | $0.00 |
| Output / 1M tokens | $0.00 | $0.00 |
| Context window | 1M | 256K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Sep 2026 | Aug 2025 |
| LMArena WebDev Elo score | — | 1166 |
FAQ
Is Agentic Chat (Claude Sonnet 5.5) or Grok Code Fast 1 cheaper?
Agentic Chat (Claude Sonnet 5.5) and Grok Code Fast 1 have comparable output pricing.
Which has the larger context window, Agentic Chat (Claude Sonnet 5.5) or Grok Code Fast 1?
Agentic Chat (Claude Sonnet 5.5) has the larger context window (1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.