GPT-5.6 Luna vs Kimi K3
| Signal | GPT-5.6 Luna | Delta | Kimi K3 |
|---|---|---|---|
Capabilities | 100 | +17 | |
Benchmarks | 88 | +10 | |
Pricing | 94 | +9 | |
Context window size | 86 | -- | |
Recency | 100 | -- | |
Output Capacity | 85 | +65 | |
| Overall Result | 4 wins | of 6 | 0 wins |
Score History
88.5
current score
GPT-5.6 Luna
right now
78.8
current score
GPT-5.6 Luna
OpenAI
Kimi K3
Moonshot AI
GPT-5.6 Luna saves you $650.00/month
That's $7800.00/year compared to Kimi K3 at your current usage level of 100K calls/month.
| Metric | GPT-5.6 Luna | Kimi K3 | Winner |
|---|---|---|---|
| Overall Score | 89 | 79 | GPT-5.6 Luna |
| Rank | #20 | #61 | GPT-5.6 Luna |
| Quality Rank | #20 | #61 | GPT-5.6 Luna |
| Adoption Rank | #20 | #61 | GPT-5.6 Luna |
| Parameters | -- | -- | -- |
| Context Window | 1050K | 1049K | GPT-5.6 Luna |
| Pricing | $1.00/$6.00/M | $3.00/$15.00/M | -- |
| Signal Scores | |||
| Capabilities | 100 | 83 | GPT-5.6 Luna |
| Benchmarks | 88 | 78 | GPT-5.6 Luna |
| Pricing | 94 | 85 | GPT-5.6 Luna |
| Context window size | 86 | 86 | GPT-5.6 Luna |
| Recency | 100 | 100 | GPT-5.6 Luna |
| Output Capacity | 85 | 20 | GPT-5.6 Luna |
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 #20), placing it in the top 93% of all 290 models tracked.
Scores 79/100 (rank #61), placing it in the top 79% of all 290 models tracked.
GPT-5.6 Luna has a 10-point advantage, which typically translates to noticeably better performance on complex reasoning, code generation, and multi-step tasks.
Choose GPT-5.6 Luna when you need:
- High-volume production workloads where API costs must be minimized
- Step-by-step reasoning and chain-of-thought problem solving
Choose Kimi K3 when you need:
- Step-by-step reasoning and chain-of-thought problem solving
GPT-5.6 Luna offers 61% better value per quality point. At 1M tokens/day, you'd spend $105.00/month with GPT-5.6 Luna vs $270.00/month with Kimi K3 - a $165.00 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. GPT-5.6 Luna also offers lower per-token costs for high-volume support
Long document analysis
Larger context window (1050K tokens) can process longer documents, contracts, and research papers in a single pass
Batch data extraction
Lower output pricing ($6.00/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-5.6 Luna has a moderate advantage with a 9.700000000000003-point lead in composite score. It wins on more signal dimensions, but Kimi K3 has specific strengths that could make it the better choice for certain workflows.
By Use Case
Best for Quality
GPT-5.6 Luna
Marginally better benchmark scores; both are excellent
Best for Cost
GPT-5.6 Luna
61% lower pricing; better value at scale
Best for Reliability
GPT-5.6 Luna
Higher uptime and faster response speeds
Best for Prototyping
GPT-5.6 Luna
Stronger community support and better developer experience
Best for Production
GPT-5.6 Luna
Wider enterprise adoption and proven at scale
by OpenAI
- Choose for Quality - Marginally better benchmark scores; both are excellent
- Choose for Cost - 61% lower pricing; better value at scale
- 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-5.6 Luna | Kimi K3 |
|---|---|---|
| Vision (Image Input) | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Searchdiffers | ||
| Image Output |
GPT-5.6 Luna
OpenAI
Kimi K3
Moonshot AI
GPT-5.6 Luna saves you $14.40/month
That's 62% cheaper than Kimi K3 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-5.6 Luna | Kimi K3 |
|---|---|---|
| Context Window | 1.1M | 1.0M |
| Max Output Tokens | 128,000 | -- |
| Open Source | No | No |
| Created | Jul 9, 2026 | Jul 16, 2026 |