Devstral Small 1.1 vs Grok Code Fast 1

Across our 12-test suite (scores 1–5): Grok Code Fast 1 wins in agentic planning (5 vs 2), creative problem solving (3 vs 2), strategic analysis (3 vs 2) and persona consistency (4 vs 2). Devstral Small 1.1 does not outright win any benchmark. They tie on structured output (4/4), constrained rewriting (3/3), tool calling (4/4), faithfulness (4/4), classification (4/4), long context (4/4), safety calibration (2/2) and multilingual (4/4). Context and rank context: Grok’s agentic planning score ties for 1st of 54 models (tied with 14 others) while Devstral ranks 53 of 54 for that metric — a practical difference for workflows that require robust goal decomposition and recovery. Both models tie for classification at the top (tied for 1st with 29 others), and both rank similarly on structured output (rank 26 of 54). For real tasks: expect identical results for schema/format adherence, classification routing, long-context retrieval (both score 4), and comparable safety calibration (both score 2). Choose Grok when you need stronger planning, stepwise reasoning, and creative idea generation; choose Devstral when you need the same baseline capabilities at far lower per-token cost.

Per the payload: Devstral Small 1.1 charges $0.10 input and $0.30 output per mTok; Grok Code Fast 1 charges $0.20 input and $1.50 output per mTok. Using a 50/50 input/output split as an example: 1M tokens/month = 1,000 mTok → Devstral ≈ $200/month (500*$0.10 + 500*$0.30); Grok ≈ $850/month (500*$0.20 + 500*$1.50). At 10M tokens/month: Devstral ≈ $2,000 vs Grok ≈ $8,500. At 100M tokens/month: Devstral ≈ $20,000 vs Grok ≈ $85,000. If your workload is output-heavy, the gap widens (e.g., 1M output-only tokens = Devstral $300 vs Grok $1,500). Who should care: high-volume deployments, startups on budgets, or ML infra teams — a switch to Grok can increase monthly model spend by tens of thousands at scale; single-developer or low-volume projects may accept Grok’s premium for better planning/creative outputs.

Choose Devstral Small 1.1 if you need cost-efficient, reliable structured output, classification, tool-calling and long-context work at $0.10 input / $0.30 output per mTok. Choose Grok Code Fast 1 if you require stronger agentic planning, creative problem solving and persona consistency (agentic planning 5 vs 2) and the larger 256k context window, and you can absorb the higher output cost ($1.50 per mTok). If budget is tight or you run >10M tokens/month, Devstral’s price advantage is decisive; if your product depends on planning/creative reasoning, Grok’s performance edge matters despite the cost.