Grok 4.5 vs Kimi K2.6: Specs & Benchmark Comparison
Grok 4.5 is developed by xAI, while Kimi K2.6 comes from Moonshot AI. Kimi K2.6 was released in April 2026, and Grok 4.5 followed 3 months later in July 2026. Kimi K2.6 has a published size of about 1.0 trillion parameters; xAI has not disclosed the parameter count of Grok 4.5.
The two models share 2 published benchmarks. Grok 4.5 leads on 2 of them. The widest gaps are on SWE-Bench Pro, where Grok 4.5 scores 65.0% against 58.6%; GPQA, where Grok 4.5 scores 93.0% against 90.5%. Averaged across everything we track, Grok 4.5 sits at 52.9% and Kimi K2.6 at 71.2%.
Kimi K2.6 is the cheaper API at $1.20 per million input tokens and $4.50 per million output tokens, about 67% below Grok 4.5 at $2 and $6. Grok 4.5 takes the larger context window at 500K tokens, compared with 262K for Kimi K2.6. Both accept text and images as input.
| Characteristic | Grok 4.5 | Kimi K2.6 |
|---|---|---|
| Company | xAI | Moonshot AI |
| Release Date | July 16, 2026 | April 20, 2026 |
| Parameters | — | 1.0T |
| Multimodal | Yes | Yes |
| Context (input) | 500K | 262K |
| Context (output) | — | 131K |
| Input Price / 1M | $2.00 | $1.20 |
| Output Price / 1M | $6.00 | $4.50 |
| Average Score | 52.9% | 71.2% |
| Benchmarks | ||
| SWE-Bench Pro | 65.0% | 58.6% |
| GPQA | 93.0% | 90.5% |
Visual Benchmark Comparison
Verdict
Grok 4.5 leads in 2 out of 4 comparison categories.
Both models show comparable average scores: Grok 4.5 — 0.5, Kimi K2.6 — 0.7.
Kimi K2.6 is 1.4x cheaper: input $1.20/1M vs $2.00/1M tokens.
Grok 4.5 supports a larger context: 500K vs 262K tokens.
Grok 4.5 is newer: released 7/16/2026 vs 4/20/2026.
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Frequently Asked Questions
Which is better for coding — Grok 4.5 or Kimi K2.6?
Which model is cheaper — Grok 4.5 or Kimi K2.6?
Which has a larger context window — Grok 4.5 or Kimi K2.6?
The Grok 4.5 and Kimi K2.6 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Grok 4.5 or Kimi K2.6 page. See also the complete list of AI model comparisons.