GPT-5.1 Codex High vs Kimi K2 0905: Specs & Benchmark Comparison
| Characteristic | GPT-5.1 Codex High | Kimi K2 0905 |
|---|---|---|
| Company | OpenAI | Moonshot AI |
| Release Date | November 11, 2025 | September 5, 2025 |
| Parameters | — | 1.0T |
| Multimodal | Yes | No |
| Context (input) | 400K | 262K |
| Context (output) | 128K | 262K |
| Input Price / 1M | $1.25 | $0.60 |
| Output Price / 1M | $10.00 | $2.50 |
| Average Score | 1.0 | 0.8 |
Verdict
GPT-5.1 Codex High leads in 2 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: GPT-5.1 Codex High — 1.0, Kimi K2 0905 — 0.8.
API Cost
Kimi K2 0905 is 3.6x cheaper: input $0.60/1M vs $1.25/1M tokens.
Context Window
GPT-5.1 Codex High supports a larger context: 400K vs 262K tokens.
Recency
GPT-5.1 Codex High is newer: released 11/11/2025 vs 9/5/2025.
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Frequently Asked Questions
Which is better for coding — GPT-5.1 Codex High or Kimi K2 0905?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — GPT-5.1 Codex High or Kimi K2 0905?
Kimi K2 0905 is cheaper for input: $0.60 per 1M tokens vs $1.25.
Which has a larger context window — GPT-5.1 Codex High or Kimi K2 0905?
GPT-5.1 Codex High supports a larger context: 400,000 tokens vs 262,144.
The GPT-5.1 Codex High and Kimi K2 0905 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-5.1 Codex High or Kimi K2 0905 page. See also the complete list of AI model comparisons.