AllocateKimi K2.5 vs OpenAI GPT-OSS 20B
On provider list prices, OpenAI GPT-OSS 20B costs $0.05 per million input tokens against $0.50 for Kimi K2.5: 10.0x apart. Output is $0.20 against $2.80 (14.0x). On Allocate both bill at list plus the 7% transaction fee.
Kimi K2.5
OpenAI GPT-OSS 20BSpecifications and provider list prices from the Allocate catalog, checked 2026-07-08. Billed price is list plus the 7% transaction fee.
What the numbers say
Take 1,000,000 requests a month at 1,200 input and 350 output tokens each. That workload costs $130 a month on OpenAI GPT-OSS 20B and $1,580 on Kimi K2.5 at list: a gap of $1,450, or 12.2x.
Kimi K2.5 reads 256K tokens per request against 128K for OpenAI GPT-OSS 20B, 2.0x 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 OpenAI GPT-OSS 20B for
- The lower list price ($0.05 in / $0.20 out per M tokens)
- Fine-tuning under a permissive license (Apache 2.0)
Common questions
Which is cheaper, Kimi K2.5 or OpenAI GPT-OSS 20B?
OpenAI GPT-OSS 20B, on this workload shape. At list prices it is $0.05/$0.20 per million tokens in and out against $0.50/$2.80 for Kimi K2.5. Billed on Allocate: $0.053/$0.21 against $0.54/$3.00, list plus 7%.
Which has the bigger context window?
Kimi K2.5: 262,144 tokens (256K) against 131,072 (128K) for OpenAI GPT-OSS 20B.
Can I fine-tune Kimi K2.5 or OpenAI GPT-OSS 20B?
Both publish open weights (Kimi K2.5: Not listed; OpenAI GPT-OSS 20B: Apache 2.0), so both can be fine-tuned. On Allocate the trained weights stay inside your boundary and belong to you.
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.