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OpenAI GPT-OSS 120B vs Qwen 3.5

On provider list prices, OpenAI GPT-OSS 120B costs $0.15 per million input tokens against $0.60 for Qwen 3.5: 4.0x apart. Output is $0.60 against $3.60 (6.0x). On Allocate both bill at list plus the 7% transaction fee.

OpenAI GPT-OSS 120B Qwen 3.5
LabOpenAIQwen
AccessOpen weightsOpen weights
Context window128K tokens256K tokens
List price, input$0.15 / M tokens$0.6 / M tokens
List price, output$0.6 / M tokens$3.6 / M tokens
Cached inputn/a$0.35 / M tokens
LicenseCustom licenseApache 2.0
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 $1,980 on Qwen 3.5 at list: a gap of $1,590, or 5.1x.

Qwen 3.5 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
Qwen 3.5$0.60$3.60
InputOutput

Choose OpenAI GPT-OSS 120B for

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

Choose Qwen 3.5 for

  • Multilingual support agents
  • Translation-adjacent workflows
  • Fine-tuning under Apache 2.0
Qwen 3.5 details

Common questions

Which is cheaper, OpenAI GPT-OSS 120B or Qwen 3.5?

OpenAI GPT-OSS 120B, on this workload shape. At list prices it is $0.15/$0.60 per million tokens in and out against $0.60/$3.60 for Qwen 3.5. Billed on Allocate: $0.16/$0.64 against $0.64/$3.85, list plus 7%.

Which has the bigger context window?

Qwen 3.5: 262,144 tokens (256K) against 131,072 (128K) for OpenAI GPT-OSS 120B.

Can I fine-tune OpenAI GPT-OSS 120B or Qwen 3.5?

Both publish open weights (OpenAI GPT-OSS 120B: Custom license; Qwen 3.5: Apache 2.0), so both can be fine-tuned. On Allocate the trained weights stay inside your boundary and belong to you.

Related comparisons

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Run the numbers on your workload

LLM price comparisonAgent cost calculatorOpenAI GPT-OSS 120BQwen 3.5

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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