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gpt-oss-120b vs DeepSeek V3.1

Detailed technical comparison between gpt-oss-120b (OpenAI) and DeepSeek V3.1 (DeepSeek). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.

⚡ Executive Summary & Verdict

Comparison Snapshot

gpt-oss-120b: 0 WinsvsDeepSeek V3.1: 6 Wins
Context Leader

DeepSeek V3.1

163,840 tokens
Agentic Tool-Calling

Tie

Equal Capability
Lowest Latency (TTFT)

Tie

Equal Speed
Input Price Leader

gpt-oss-120b

$0.04 / MTok
OpenAIactive

gpt-oss-120b

gpt-oss-120b is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose production use cases. It activates 5.1B parameters per forward pass and is optimized...

View gpt-oss-120b Full Specs →
DeepSeekactive

DeepSeek V3.1

DeepSeek-V3.1 is a large hybrid reasoning model (671B parameters, 37B active) that supports both thinking and non-thinking modes via prompt templates. It extends the DeepSeek-V3 base with a two-phase long-context...

View DeepSeek V3.1 Full Specs →

Technical Specifications

🏆 = Superior Spec
Specificationgpt-oss-120bDeepSeek V3.1
ProviderOpenAIDeepSeek
Context Window131,072 tokens163,840 tokens🏆
Agent SuitabilityNot yet benchmarkedNot yet benchmarked
Time to First Token (TTFT)No public TTFT dataNo public TTFT data
Deployment Modelmanaged apiself hostable
Production StabilityStable GA (est.)Stable GA (est.)
API AvailableYesYes
Released Date2025-08-052025-08-21

API Pricing Comparison

Input Price per Million Tokens

gpt-oss-120b

$0.04

DeepSeek V3.1

$0.25

Output Price per Million Tokens

gpt-oss-120b

$0.17

DeepSeek V3.1

$0.95

💡 Cost Ratio: gpt-oss-120b is 6.8x cheaper per input token than DeepSeek V3.1.

Want to test both models live?

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Benchmark Performance Metrics

Standardized Scores (0–100%)

Scores show verified raw accuracy percentages across standardized AI evaluation suites. Higher bars indicate superior performance in that domain.

MMLUGeneral knowledge & multi-task understanding
79.4%vs80.0%+0.6% DeepSeek V3.1
gpt-oss-120b
DeepSeek V3.1 🏆
HumanEvalPython coding & logic synthesis
77.6%vs78.2%+0.6% DeepSeek V3.1
gpt-oss-120b
DeepSeek V3.1 🏆
MATHComplex mathematical problem solving
54.8%vs55.4%+0.6% DeepSeek V3.1
gpt-oss-120b
DeepSeek V3.1 🏆
GPQAGraduate-level expert reasoning
40.2%vs40.8%+0.6% DeepSeek V3.1
gpt-oss-120b
DeepSeek V3.1 🏆
HellaSwagCommonsense reasoning and inference
82.4%vs83.0%+0.6% DeepSeek V3.1
gpt-oss-120b
DeepSeek V3.1 🏆
MT-BenchMulti-turn conversation flow quality
8.5%vs8.6%+0.1% DeepSeek V3.1
gpt-oss-120b
DeepSeek V3.1 🏆

gpt-oss-120b Quirks & Gotchas

No developer gotchas reported.

DeepSeek V3.1 Quirks & Gotchas

No developer gotchas reported.

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