AI model comparison
Kimi K2 0905 vs o4 Mini
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
Moonshot AI
Kimi K2 0905
Kimi K2 0905 is the September update of [Kimi K2 0711](moonshotai/kimi-k2).
- Input / 1M
- $0.60
- Output / 1M
- $2.50
- Context
- 262K
OpenAI
o4 Mini
OpenAI o4-mini is a compact reasoning model in the o-series, optimized for fast, cost-efficient performance while retaining strong multimodal and agentic capabilities.
- Input / 1M
- $1.10
- Output / 1M
- $4.40
- Context
- 200K
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Kimi K2 0905
1.8x cheaper for a typical chat
Higher intelligence score
o4 Mini
16.7 vs 15.3 on Artificial Analysis
Larger context window
Kimi K2 0905
262K vs 200K tokens
Newer release
Kimi K2 0905
Released September 4, 2025
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
o4 Mini16.7Coding index
o4 MiniNot availableAgentic index
o4 MiniNot availablePricing
Kimi K2 0905 vs o4 Mini API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | o4 Mini | |
|---|---|---|
| Input tokensPer 1M tokens | $0.60 | $1.10 |
| Output tokensPer 1M tokens | $2.50 | $4.40 |
| Cached input (read)Per 1M tokens | Not available | $0.28 |
| Cache writePer 1M tokens | Not available | Not available |
| Web searchPer request | Not available | $0.01 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
o4 Mini$4.40Coding task
30K in, 4K out
o4 Mini$50.60$25.85 cachedLong document summary
150K in, 2K out
o4 Mini$173.80$50.05 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | o4 Mini | |
|---|---|---|
| Context window | 262K tokens | 200K tokens |
| Max output | 98K tokens | 100K tokens |
| Input types | Text | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | Not available | Not available |
| Default reasoning effort | Not available | Not available |
| Release date | September 4, 2025 | April 16, 2025 |
Features
Supported features
API features available for each model.
| Metric | o4 Mini | |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Not supported | Supported |
| Temperature | Supported | Not supported |
| Stop sequences | Supported | Not supported |
| Deterministic seed | Supported | Supported |
| Verbosity control | Not supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
- Kimi K2 0905 vs Gemini 3.1 Flash Lite
- Kimi K2 0905 vs Gemini 2.5 Flash
- Kimi K2 0905 vs Qwen3.5-122B-A10B
- Kimi K2 0905 vs Claude Haiku 4.5
- Kimi K2 0905 vs Gemini 2.5 Pro
- Kimi K2 0905 vs DeepSeek V3.1 Terminus
- Kimi K2 0905 vs Nova 2 Lite
- Kimi K2 0905 vs R1 0528
- Kimi K2 0905 vs GLM 4.5
- Kimi K2 0905 vs Kimi K2 0711
Our take
Kimi K2 0905 is 1.8x cheaper for a typical chat. o4 Mini scores higher on the Artificial Analysis Intelligence Index (16.7 vs 15.3). Kimi K2 0905 has the larger context window (262K vs 200K tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Kimi K2 0905 or o4 Mini cheaper?
Kimi K2 0905 is cheaper for a typical chat (2K input tokens and 500 output tokens). Kimi K2 0905 costs $0.60 per 1M input tokens and $2.50 per 1M output tokens, while o4 Mini costs $1.10 per 1M input tokens and $4.40 per 1M output tokens.
Which has a bigger context window, Kimi K2 0905 or o4 Mini?
Kimi K2 0905 supports up to 262K tokens of context, compared with 200K for o4 Mini.
Is Kimi K2 0905 smarter than o4 Mini?
On the Artificial Analysis Intelligence Index, Kimi K2 0905 scores 15.3 and o4 Mini scores 16.7, putting o4 Mini ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Kimi K2 0905 and o4 Mini at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Kimi K2 0905 and o4 Mini answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Kimi K2 0905 and o4 Mini at the same time. Compare the answers side by side and keep the best one.