Kimi K2.5 vs o4 Mini
Complete pricing and performance comparison between Moonshot's Kimi K2.5 and OpenAI's o4 Mini.
Quick Verdict
Cheaper
Kimi K2.5
1.8x cheaper input, 1.5x cheaper output
Larger Context
o4 Mini
200K vs 128K
Higher Quality
Kimi K2.5
Score: 47 vs 33
Faster
o4 Mini
140 vs 46 tok/s
Pricing Comparison
| Spec | Kimi K2.5 | o4 Mini | Difference |
|---|---|---|---|
| Provider | Moonshot | OpenAI | |
| Input / 1M tokens | $0.6 | $1.1 | Kimi K2.5 is 45% more expensive |
| Output / 1M tokens | $3 | $4.4 | Kimi K2.5 is 32% more expensive |
| Context Window | 128K | 200K | 2x difference |
| Max Output | 33K | 100K | |
| Tokenizer | cl100k_base | o200k_base |
Performance Benchmarks
| Metric | Kimi K2.5 | o4 Mini | Winner |
|---|---|---|---|
| Quality Index | 47 | 33 | Kimi K2.5 |
| Output Speed | 46 tok/s | 140 tok/s | o4 Mini |
| Time to First Token | 1.05s | 32.98s | Kimi K2.5 |
| Value (Quality/$) | 78.0 | 30.1 | Higher = better value |
Benchmark data from Artificial Analysis. Quality Index is a composite score across reasoning, coding, and knowledge tasks.
Cost at Scale
Estimated cost at different usage levels (3:1 input-to-output token ratio, typical for chat).
| Usage | Kimi K2.5 | o4 Mini | Savings |
|---|---|---|---|
Single request 1K in / 300 out | $0.0015 | $0.0024 | Same |
10 requests 10K in / 3K out | $0.015 | $0.024 | Kimi K2.5 saves $0.0092 |
100 requests 100K in / 30K out | $0.150 | $0.242 | Kimi K2.5 saves $0.092 |
1,000 requests 1M in / 300K out | $1.50 | $2.42 | Kimi K2.5 saves $0.920 |
10,000 requests 10M in / 3M out | $15.00 | $24.20 | Kimi K2.5 saves $9.20 |
1M requests/mo 1B in / 300M out | $1500.00 | $2420.00 | Kimi K2.5 saves $920.00 |
Pros & Cons
Kimi K2.5 Strengths
- +Cheaper input tokens
- +Cheaper output tokens
- +Higher quality score (47 vs 33)
- +Lower latency (faster first token)
o4 Mini Strengths
- +Larger context window (200K vs 128K)
- +Higher max output tokens
- +Faster output (140 vs 46 tok/s)
When to Use Each Model
Choose Kimi K2.5 for
- →Budget-conscious projects where cost is the primary factor
- →Tasks requiring maximum accuracy and reasoning
Choose o4 Mini for
- →Long documents, large codebases, or multi-turn conversations
- →Generating long-form content or detailed code
- →Real-time applications, chat, or autocomplete
Frequently Asked Questions
Which is cheaper, Kimi K2.5 or o4 Mini?
For input tokens, Kimi K2.5 is 1.8x cheaper at $0.6/1M tokens. For output tokens, Kimi K2.5 is 1.5x cheaper at $3/1M tokens. At typical usage (1M input + 300K output), Kimi K2.5 costs $1.50 vs o4 Mini at $2.42.
What's the context window difference?
Kimi K2.5 supports 128K context (128,000 tokens), while o4 Mini supports 200K (200,000 tokens). o4 Mini can handle 2x more context in a single request.
Which model has better benchmarks?
Quality Index: Kimi K2.5 scores 47 vs o4 Mini at 33. Speed: Kimi K2.5 generates 46 tok/s vs o4 Mini at 140 tok/s. Time to first token: Kimi K2.5 at 1.05s vs o4 Mini at 32.98s.
When should I choose Kimi K2.5 over o4 Mini?
Choose Kimi K2.5 when you need: Cheaper input tokens, Cheaper output tokens, Higher quality score (47 vs 33), Lower latency (faster first token). Choose o4 Mini when you need: Larger context window (200K vs 128K), Higher max output tokens, Faster output (140 vs 46 tok/s).
How much would 10,000 API requests cost?
At 1K input + 300 output tokens per request (typical chat): Kimi K2.5 = $15.00, o4 Mini = $24.20. At 10K input + 1K output per request (longer conversations): Kimi K2.5 = $90.00, o4 Mini = $154.00.