AllocateKimi K2.5 vs Claude Opus 4.8
On provider list prices, Kimi K2.5 costs $0.50 per million input tokens against $5 for Claude Opus 4.8: 10.0x apart. Output is $2.80 against $25 (8.9x).
Kimi K2.5
Claude Opus 4.8Specifications and provider list prices from the Allocate catalog, checked 2026-07-21.
What the numbers say
Take 1,000,000 requests a month at 1,200 input and 350 output tokens each. That workload costs $1,580 a month on Kimi K2.5 and $14,750 on Claude Opus 4.8 at list: a gap of $13,170, or 9.3x.
Kimi K2.5 reads 256K tokens per request against 200K for Claude Opus 4.8, 1.3x the window. That decides which one can take whole documents without splitting them.
Choose Kimi K2.5 for
- Whole-document reasoning
- Long-context retrieval
- Open-weight fine-tuning
Choose Claude Opus 4.8 for
- Hardest reasoning problems
- High-stakes analysis
- Escalation tier for agents
Common questions
Which is cheaper, Kimi K2.5 or Claude Opus 4.8?
Kimi K2.5, on this workload shape. At list prices it is $0.50/$2.80 per million tokens in and out against $5/$25 for Claude Opus 4.8. Billed on Allocate: $0.54/$3.00 against $5.35/$26.75.
Which has the bigger context window?
Kimi K2.5: 262,144 tokens (256K) against 200,000 (200K) for Claude Opus 4.8.
Can I fine-tune Kimi K2.5 or Claude Opus 4.8?
Kimi K2.5 publishes open weights (Not listed) and can be fine-tuned on your own data. Claude Opus 4.8 is a closed model served over API; its weights are not available.
Related comparisons
Run the numbers on your workload
Or don’t choose. On Allocate a route name is the contract: point yours at one model today, swap to the other tomorrow, and compare them on your live traffic with per-token metering.