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Grok 4.3 vs OpenAI GPT-OSS 120B

Grok 4.3 is not currently in the Allocate serving catalog, so this page lists no prices for it: every price on this site comes from the live catalog.

Grok 4.3 OpenAI GPT-OSS 120B
LabxAIOpenAI
AccessNot served on AllocateOpen weights
Context windown/a128K tokens
List price, inputNot served$0.15 / M tokens
List price, outputNot served$0.6 / M tokens
Cached inputn/an/a
LicenseProprietary APICustom license
Fine-tunableNoYes

Specifications and provider list prices from the Allocate catalog, checked 2026-07-08. Billed price is list plus the 7% transaction fee.

Choose Grok 4.3 for

  • Freshness-sensitive answers
  • Fast reasoning turns
  • Research assistants
Grok 4.3 details

Choose OpenAI GPT-OSS 120B for

  • Open weights you can fine-tune and own
OpenAI GPT-OSS 120B details

Common questions

Which has the bigger context window?

OpenAI GPT-OSS 120B: 131,072 tokens (128K) against an unlisted window for Grok 4.3.

Can I fine-tune Grok 4.3 or OpenAI GPT-OSS 120B?

OpenAI GPT-OSS 120B publishes open weights (Custom license) and can be fine-tuned on your own data. Grok 4.3 is a closed model served over API; its weights are not available.

Related comparisons

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Run the numbers on your workload

LLM price comparisonAgent cost calculatorGrok 4.3OpenAI 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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