Head-to-head showdown: Grok 4.5 ($2.00 in / $6.00 out per 1M) vs Devstral 2 (2512) (OpenRouter) ($0.44 in / $2.20 out per 1M). Devstral 2 (2512) (OpenRouter) is 3.0× cheaper across standard token mixes, with 500K vs 262.1K context windows.
grok-4-5 · xai
devstral-2512 · mistral
Benchmark
| Workload Scenario | Grok 4.5 | Devstral 2 (2512) (OpenRouter) | Price Delta |
|---|---|---|---|
| 1M input tokens (raw text) | $2.00 | $0.44 | +$1.56 |
| 1M output tokens (generation) | $6.00 | $2.20 | +$3.80 |
| 1M tokens · 70% input / 30% output mix | $3.20 | $0.968 | +$2.232 |
| Standard chat turn (4K in / 800 out, 50% cached) | $0.0094 | $0.002728 | +$0.006672 |
| Monthly scale (10K requests / day) | $2,820.00 | $818.40 | +$2,001.60 |
Negative difference = Grok 4.5 is cheaper. Positive = Devstral 2 (2512) (OpenRouter) is cheaper.
Scaling Curve
Total cost of a token volume at 70/30 input/output split (uncached). Log-log scale.
Verdict
Devstral 2 (2512) (OpenRouter) is cheaper on both input and output rates, so it costs less at every input/output mix. Price alone still isn't the whole decision: capability, latency and context limits (Grok 4.5: 500K, Devstral 2 (2512) (OpenRouter): 262.1K) may justify the premium for your task.
FAQ
On input, Devstral 2 (2512) (OpenRouter) is cheaper ($0.44/M vs $2.00/M). On output, Devstral 2 (2512) (OpenRouter) is cheaper ($2.20/M vs $6.00/M). The same model is cheaper on both sides, so it wins at every mix.
A chat-style request (4,000 input + 800 output tokens, 50% cached) costs $0.0094 on Grok 4.5 and $0.002728 on Devstral 2 (2512) (OpenRouter) — Devstral 2 (2512) (OpenRouter) is 3.4× more expensive for that workload.
Grok 4.5 supports 500,000 tokens (64K max output); Devstral 2 (2512) (OpenRouter) supports 262,144 (209.7K max output). Grok 4.5 fits 1.9× more context, which matters for long documents and agents.