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Comparisons

Kimi K2.5 vs OpenAI GPT-OSS 120B

On provider list prices, OpenAI GPT-OSS 120B costs $0.15 per million input tokens against $0.50 for Kimi K2.5: 3.3x apart. Output is $0.60 against $2.80 (4.7x). On Allocate both bill at list plus the 7% transaction fee.

Kimi K2.5 OpenAI GPT-OSS 120B
LabTogethercomputerOpenAI
AccessOpen weightsOpen weights
Context window256K tokens128K tokens
List price, input$0.5 / M tokens$0.15 / M tokens
List price, output$2.8 / M tokens$0.6 / M tokens
Cached inputn/an/a
LicenseNot listedCustom license
Fine-tunableYesYes

Specifications 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 $390 a month on OpenAI GPT-OSS 120B and $1,580 on Kimi K2.5 at list: a gap of $1,190, or 4.1x.

Kimi K2.5 reads 256K tokens per request against 128K for OpenAI GPT-OSS 120B, 2.0x the window. That decides which one can take whole documents without splitting them.

OpenAI GPT-OSS 120B$0.15$0.60
Kimi K2.5$0.50$2.80
InputOutput

Choose Kimi K2.5 for

  • Whole-document reasoning
  • Long-context retrieval
  • Open-weight fine-tuning
Kimi K2.5 details

Choose OpenAI GPT-OSS 120B for

  • The lower list price ($0.15 in / $0.60 out per M tokens)
OpenAI GPT-OSS 120B details

Common questions

Which is cheaper, Kimi K2.5 or OpenAI GPT-OSS 120B?

OpenAI GPT-OSS 120B, on this workload shape. At list prices it is $0.15/$0.60 per million tokens in and out against $0.50/$2.80 for Kimi K2.5. Billed on Allocate: $0.16/$0.64 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 120B.

Can I fine-tune Kimi K2.5 or OpenAI GPT-OSS 120B?

Both publish open weights (Kimi K2.5: Not listed; OpenAI GPT-OSS 120B: Custom license), so both can be fine-tuned. On Allocate the trained weights stay inside your boundary and belong to you.

Related comparisons

Kimi K2.5 vs OpenAI GPT-OSS 20BOpenAI GPT-OSS 120B vs OpenAI GPT-OSS 20BKimi K2.5 vs GPT-5.5OpenAI GPT-OSS 120B vs GPT-5.5Kimi K2.5 vs Meta Llama 3.3 70B Instruct TurboOpenAI GPT-OSS 120B vs Meta Llama 3.3 70B Instruct Turbo

Run the numbers on your workload

LLM price comparisonAgent cost calculatorKimi K2.5OpenAI GPT-OSS 120B

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.

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