GPT-5 Chat vs Kimi K2 0905
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for GPT-5 Chat and Kimi K2 0905.
GPT-5 Chat
GPT-5 Chat is designed for advanced, natural, multimodal, and context-aware conversations for enterprise applications.
Kimi K2 0905
Kimi K2 0905 is the September update of [Kimi K2 0711](moonshotai/kimi-k2). It is a large-scale Mixture-of-Experts (MoE) language model developed by Moonshot AI, featuring 1 trillion total parameters with 32...
Technical Specifications
| Specification | GPT-5 Chat | Kimi K2 0905 |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Context Window | 128,000 tokens | 262,144 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | stable | stable |
| API Available | Yes | Yes |
| Released Date | 2025-08-07 | 2025-09-04 |
API Pricing Comparison
Input Price per Million Tokens
GPT-5 Chat
$1.25
Kimi K2 0905
$0.60
Output Price per Million Tokens
GPT-5 Chat
$10.00
Kimi K2 0905
$2.50
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Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
GPT-5 Chat Quirks & Gotchas
No developer gotchas reported.
Kimi K2 0905 Quirks & Gotchas
No developer gotchas reported.