Updated March 26, 2026· Based on independent benchmark data
Grok 4.20 Beta 0309 (Reasoning) and Kimi K2.5 (Reasoning) are virtually tied on intelligence (48.5 vs 46.8). Kimi K2.5 (Reasoning) is 3.3x cheaper at $0.60/1M tokens vs $2.00/1M. For speed, Grok 4.20 Beta 0309 (Reasoning) wins at 246 tok/s vs 34 tok/s.
| Metric | Grok 4.20 Beta 0309 (Reasoning) | Kimi K2.5 (Reasoning) |
|---|---|---|
| Intelligence Score | 48.5 | 46.8 |
| Coding Score | 42.2 | 39.5 |
| Math Score | N/A | N/A |
| Speed (tok/s) | 246 tok/s | 34 tok/s |
| Latency (TTFT) | 11.75s | 1.40s |
| Input Price / 1M tokens | $2.00 | $0.60 |
| Output Price / 1M tokens | $6.00 | $3.00 |
| Context Window | N/A |
Grok 4.20 Beta 0309 (Reasoning) and Kimi K2.5 (Reasoning) perform similarly on overall intelligence, scoring 48.5 and 46.8 respectively. For coding tasks, Grok 4.20 Beta 0309 (Reasoning) has the edge with a coding score of 42.2 vs 39.5.
Grok 4.20 Beta 0309 (Reasoning) generates output significantly faster at 246 tok/s compared to Kimi K2.5 (Reasoning)'s 34 tok/s, making it 7.2x faster for streaming responses. Time to first token is 1.40s for Kimi K2.5 (Reasoning) vs 11.75s for Grok 4.20 Beta 0309 (Reasoning), which affects perceived responsiveness in interactive applications.
Kimi K2.5 (Reasoning) is more affordable at $0.60/1M input tokens ($3.00/1M output), while Grok 4.20 Beta 0309 (Reasoning) costs $2.00/1M input ($6.00/1M output). That makes Grok 4.20 Beta 0309 (Reasoning) 3.3x more expensive per token, which can add up significantly at scale. For a typical workload of 100 requests per day at 2,000 tokens each, Grok 4.20 Beta 0309 (Reasoning) would cost approximately $12.00/month vs $3.60/month for Kimi K2.5 (Reasoning) in input costs alone.
Choose Grok 4.20 Beta 0309 (Reasoning) when you need stronger coding performance (42.2), faster output (246 tok/s). Choose Kimi K2.5 (Reasoning) when you need lower cost.
Grok 4.20 Beta 0309 (Reasoning) scores higher on coding benchmarks (42.2 vs 39.5), making it the better choice for programming tasks.
Kimi K2.5 (Reasoning) is cheaper at $0.60/1M input tokens vs $2.00/1M for Grok 4.20 Beta 0309 (Reasoning).
Grok 4.20 Beta 0309 (Reasoning) is faster, producing output at 246 tok/s compared to Kimi K2.5 (Reasoning)'s 34 tok/s.
No, Grok 4.20 Beta 0309 (Reasoning) does not support image input. Neither model supports image input.
Data last synced: March 26, 2026
| N/A |
| Max Output Tokens | N/A | N/A |
| Input Modalities | Text | Text |
| Output Modalities | Text | Text |
| Free Tier | No | No |
Both models perform similarly on intelligence benchmarks. Choose based on specific needs: pricing, speed, context window, or provider ecosystem.