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Comparisons /

DeepSeek V4.1 Flash vs OpenAI GPT-OSS 120B

On provider list prices, DeepSeek V4.1 Flash costs $0.15 per million input tokens against $0.15 for OpenAI GPT-OSS 120B: effectively level. Output is $0.60 against $0.60.

DeepSeek V4.1 Flash OpenAI GPT-OSS 120B
LabDeepseekOpenAI
AccessOpen weightsOpen weights
Context window1M tokens128K tokens
List price, input$0.15 / M tokens$0.15 / M tokens
List price, output$0.6 / 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 2026-07-21.

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 DeepSeek V4.1 Flash and $390 on OpenAI GPT-OSS 120B at list: a gap of $0.

DeepSeek V4.1 Flash reads 1M tokens per request against 128K for OpenAI GPT-OSS 120B, 8.0x the window. That decides which one can take whole documents without splitting them.

DeepSeek V4.1 Flash$0.15$0.60
OpenAI GPT-OSS 120B$0.15$0.60
InputOutput

Choose DeepSeek V4.1 Flash for

  • The longer context window (1M vs 128K tokens)
DeepSeek V4.1 Flash details →

Choose OpenAI GPT-OSS 120B for

  • Training toward a model you own
OpenAI GPT-OSS 120B details →

Common questions

Which is cheaper, DeepSeek V4.1 Flash or OpenAI GPT-OSS 120B?

DeepSeek V4.1 Flash, on this workload shape. At list prices it is $0.15/$0.60 per million tokens in and out against $0.15/$0.60 for OpenAI GPT-OSS 120B. Billed on Allocate: $0.16/$0.64 against $0.16/$0.64.

Which has the bigger context window?

DeepSeek V4.1 Flash: 1,048,576 tokens (1M) against 131,072 (128K) for OpenAI GPT-OSS 120B.

Can I fine-tune DeepSeek V4.1 Flash or OpenAI GPT-OSS 120B?

Both publish open weights (DeepSeek V4.1 Flash: 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

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Run the numbers on your workload

LLM price comparisonAgent cost calculatorDeepSeek V4.1 FlashOpenAI GPT-OSS 120B

Or do not 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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