AllocateKimi K2.5 vs Claude Sonnet 5
On provider list prices, Kimi K2.5 costs $0.50 per million input tokens against $3 for Claude Sonnet 5: 6.0x apart. Output is $2.80 against $15 (5.4x).
Kimi K2.5
Claude Sonnet 5Specifications 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 $8,850 on Claude Sonnet 5 at list: a gap of $7,270, or 5.6x.
Claude Sonnet 5 reads 1M tokens per request against 256K for Kimi K2.5, 3.8x 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 Sonnet 5 for
- Judgment calls with policy context
- Customer-facing writing
- Review and escalation flows
Common questions
Which is cheaper, Kimi K2.5 or Claude Sonnet 5?
Kimi K2.5, on this workload shape. At list prices it is $0.50/$2.80 per million tokens in and out against $3/$15 for Claude Sonnet 5. Billed on Allocate: $0.54/$3.00 against $3.21/$16.05.
Which has the bigger context window?
Claude Sonnet 5: 1,000,000 tokens (1M) against 262,144 (256K) for Kimi K2.5.
Can I fine-tune Kimi K2.5 or Claude Sonnet 5?
Kimi K2.5 publishes open weights (Not listed) and can be fine-tuned on your own data. Claude Sonnet 5 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.