Kimi K2.8 Preview vs o1-preview
Comparing Kimi K2.8 Preview and o1-preview across benchmarks, pricing, and capabilities.
Moonshot AI · OpenAI · Updated for 2026
Which is better?
Kimi K2.8 Preview and o1-preview trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.
Kimi K2.8 Preview also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Kimi K2.8 Preview
- you process long inputs — it offers a 1,048,576 token context window
- you want the most recent training data — it shipped Sep 2026
Choose o1-preview
- you want predictable pricing at $15.00/M input and $60.00/M output
At a glance
The differences that matter most.
Individual benchmarks
0 reported for Kimi K2.8 Preview · 8 for o1-preview
Kimi K2.8 Preview and o1-previewdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Kimi K2.8 Preview accepts 1,048,576 input tokens compared to o1-preview's 128,000 tokens. Only o1-preview specifies output context (32,768 tokens).
Input capabilities
Documented input modalities across available providers
Kimi K2.8 Preview supports multimodal inputs, whereas o1-preview does not.
Kimi K2.8 Preview can handle both text and other forms of data like images, making it suitable for multimodal applications.
Kimi K2.8 Preview
o1-preview
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Kimi K2.8 Preview was released on 2026-09-11, while o1-preview was released on 2024-09-12.
Kimi K2.8 Preview is 24 months newer than o1-preview.
Sep 11, 2026
4 days ago
2.0yr newerSep 12, 2024
2.0 years ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Kimi K2.8 Preview is available from Moonshot AI. o1-preview is available from OpenAI, Azure.
Kimi K2.8 Preview
o1-preview
Outputs Comparison
Judge for yourself.
Run your own prompts against Kimi K2.8 Preview and o1-preview side-by-side, then vote on the output you prefer.
FAQ
Common questions about Kimi K2.8 Preview vs o1-preview.