GPT-5 Codex vs Kimi K2 0905
| Signal | GPT-5 Codex | Delta | Kimi K2 0905 |
|---|---|---|---|
Capabilities | 100 | +50 | |
Benchmarks | 88 | +37 | |
Pricing | 90 | -7 | |
Context window size | 89 | +3 | |
Recency | 77 | +3 | |
Output Capacity | 85 | +2 | |
| Overall Result | 5 wins | of 6 | 1 wins |
Score History
88.7
current score
GPT-5 Codex
right now
52.4
current score
GPT-5 Codex
OpenAI
Kimi K2 0905
Moonshot AI
Kimi K2 0905 saves you $440.00/month
That's $5280.00/year compared to GPT-5 Codex at your current usage level of 100K calls/month.
| Metric | GPT-5 Codex | Kimi K2 0905 | Winner |
|---|---|---|---|
| Overall Score | 89 | 52 | GPT-5 Codex |
| Rank | #35 | #170 | GPT-5 Codex |
| Quality Rank | #35 | #170 | GPT-5 Codex |
| Adoption Rank | #35 | #170 | GPT-5 Codex |
| Parameters | -- | -- | -- |
| Context Window | 400K | 262K | GPT-5 Codex |
| Pricing | $1.25/$10.00/M | $0.60/$2.50/M | -- |
| Signal Scores | |||
| Capabilities | 100 | 50 | GPT-5 Codex |
| Benchmarks | 88 | 51 | GPT-5 Codex |
| Pricing | 90 | 98 | Kimi K2 0905 |
| Context window size | 89 | 86 | GPT-5 Codex |
| Recency | 77 | 73 | GPT-5 Codex |
| Output Capacity | 85 | 83 | GPT-5 Codex |
Our score (0-100) is driven by benchmark performance (90%) from Arena Elo ratings, MMLU, GPQA, HumanEval, SWE-bench, and 15+ standardized evaluations. Capabilities and context window serve as tiebreakers (10%). Learn more about our methodology.
Scores 89/100 (rank #35), placing it in the top 88% of all 290 models tracked.
Scores 52/100 (rank #170), placing it in the top 42% of all 290 models tracked.
GPT-5 Codex has a 36-point advantage, which typically translates to noticeably stronger performance on complex reasoning, code generation, and multi-step tasks.
Choose GPT-5 Codex when you need:
- Processing long documents or large codebases (400K token context)
- Multimodal workflows that require image understanding
- Step-by-step reasoning and chain-of-thought problem solving
Choose Kimi K2 0905 when you need:
- High-volume production workloads where API costs must be minimized
- Self-hosted deployments where you need full control over the model
Kimi K2 0905 offers 72% better value per quality point. At 1M tokens/day, you'd spend $46.50/month with Kimi K2 0905 vs $168.75/month with GPT-5 Codex - a $122.25 monthly difference.
Both models have comparable response speeds. For most applications, the latency difference is negligible.
When latency matters most: Interactive chatbots, IDE code completion, real-time translation, and user-facing applications where response time directly impacts experience. For batch processing, background summarization, or offline analysis, latency is less critical.
Code generation & review
Based on overall model capabilities and architecture for coding tasks like generating functions, debugging, and refactoring
Customer support chatbot
Suitable for user-facing chat with competitive response times. Kimi K2 0905 also offers lower per-token costs for high-volume support
Long document analysis
Larger context window (400K tokens) can process longer documents, contracts, and research papers in a single pass
Batch data extraction
Lower output pricing ($2.50/M) reduces costs when processing thousands of records daily
Creative writing & content
Higher overall composite score (89/100) correlates with better nuance, coherence, and style in long-form content
Image understanding & OCR
Supports vision input - can analyze screenshots, diagrams, photos, and scanned documents directly
GPT-5 Codex clearly outperforms Kimi K2 0905 with a significant 36.300000000000004-point lead. For most general use cases, GPT-5 Codex is the stronger choice. However, Kimi K2 0905 may still excel in niche scenarios.
By Use Case
Best for Quality
GPT-5 Codex
Marginally better benchmark scores; both are excellent
Best for Cost
Kimi K2 0905
72% lower pricing; better value at scale
Best for Reliability
GPT-5 Codex
Higher uptime and faster response speeds
Best for Prototyping
GPT-5 Codex
Stronger community support and better developer experience
Best for Production
GPT-5 Codex
Wider enterprise adoption and proven at scale
by OpenAI
- Choose for Quality - Marginally better benchmark scores; both are excellent
- Choose for Reliability - Higher uptime and faster response speeds
- Choose for Prototyping - Stronger community support and better developer experience
- Choose for Production - Wider enterprise adoption and proven at scale
| Capability | GPT-5 Codex | Kimi K2 0905 |
|---|---|---|
| Vision (Image Input)differs | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoningdiffers | ||
| Web Searchdiffers | ||
| Image Output |
GPT-5 Codex
OpenAI
Kimi K2 0905
Moonshot AI
Kimi K2 0905 saves you $10.17/month
That's 71% cheaper than GPT-5 Codex at 1,000 tokens/request and 100 requests/day.
Assumes 60% input / 40% output token ratio per request. Actual costs may vary based on your usage pattern.
| Parameter | GPT-5 Codex | Kimi K2 0905 |
|---|---|---|
| Context Window | 400K | 262K |
| Max Output Tokens | 128,000 | 100,352 |
| Open Source | No | Yes |
| Created | Sep 23, 2025 | Sep 4, 2025 |