Kimi K2.5 InstantvsGrok 4 1 Fast Reasoning
Kimi K2.5 Instant is tied with Grok 4 1 Fast Reasoning on the Podium Score (72.0).Category wins: Kimi K2.5 Instant 0 — 0 Grok 4 1 Fast Reasoning.Kimi K2.5 Instant is the cheaper pick ($3/M vs $15/M per 1M output tokens). Kimi K2.5 Instant is faster (50 t/s vs 50 t/s).
Key VerdictAggregated 2026 Benchmark Analysis
Kimi K2.5 Instant is rated higher overall with a Podium Score of 72.0 (vs 72.0 for Grok 4 1 Fast Reasoning). Both models show closely matched capabilities across domain benchmarks.
Coding & Engineering
Comparable
Inference Speed
Kimi K2.5 Instant (50 t/s)
Cost Efficiency
Kimi K2.5 Instant ($3/M/M)
| Metric | Kimi K2.5 Instant | Grok 4 1 Fast Reasoning |
|---|---|---|
| Podium Score | 72.0 | 72.0 |
| Arena Elo | — | — |
| Intelligence Index | — | — |
| Coding | — | — |
| Math | — | — |
| Reasoning | — | — |
| Agentic | — | — |
| Knowledge | — | — |
| Multimodal | — | — |
| Long-context | — | — |
| Output speed | 50 t/s | 50 t/s |
| Output price | $3/M ▲ | $15/M |
| Context window | 128K | 128K |
Scores aggregated from five independent leaderboards. See Methodology. More head-to-heads: Kimi K2.5 Instant vs Claude Mythos · Kimi K2.5 Instant vs Claude Fable 5 · Kimi K2.5 Instant vs Kimi K3 · Kimi K2.5 Instant vs Claude Opus 5