GPT-OSS 120B vs Qwen3.5 Flash

Side-by-side benchmark comparison across agentic, coding, multimodal, knowledge, reasoning, and math workflows.

Benchmark data for one or both models is coming soon. This page currently shows metadata and pricing where BenchLM has it, and score-level comparisons will populate as public benchmark results land.
Agentic
Coding
Multimodal & Grounded
Reasoning
Knowledge
Instruction Following
Multilingual
Mathematics

GPT-OSS 120B· Qwen3.5 Flash

Quick Verdict

Benchmark data for GPT-OSS 120B and Qwen3.5 Flash is coming soon on BenchLM.

BenchLM does not have sourced benchmark coverage for Qwen3.5 Flash yet. This comparison is currently limited to metadata such as context window, reasoning mode, and pricing where available.

Qwen3.5 Flash has the larger context window at 1M, compared with 128K for GPT-OSS 120B.

Operational tradeoffs

PriceFree*Pricing unavailable
Speed262 t/sN/A
TTFT0.79sN/A
Context128K1M

Decision framing

BenchLM keeps the benchmark table and the operator tradeoffs on the same page so a better score does not hide a materially slower, pricier, or smaller-context model.

Runtime metrics show N/A when BenchLM does not have a sourced snapshot for that exact model. The scoring rules and freshness policy are documented on the methodology page.

BenchmarkGPT-OSS 120BQwen3.5 Flash
Agentic
Terminal-Bench 2.043%
BrowseComp50%
OSWorld-Verified43%
Coding
HumanEval43%
SWE-bench Verified29%
LiveCodeBench25%
SWE-bench Pro31%
SWE-Rebench33.3%
React Native Evals66.4%
Multimodal & Grounded
MMMU-Pro42%
OfficeQA Pro57%
Reasoning
MuSR47%
BBH73%
LongBench v258%
MRCRv259%
Knowledge
MMLU90%
GPQA80.9%
SuperGPQA48%
MMLU-Pro90%
HLE5%
FrontierScience49%
SimpleQA49%
Instruction Following
IFEval79%
Multilingual
MGSM72%
MMLU-ProX70%
Mathematics
AIME 202351%
AIME 202453%
AIME 202552%
HMMT Feb 202347%
HMMT Feb 202449%
HMMT Feb 202548%
BRUMO 202550%
MATH-50071%
Frequently Asked Questions (3)

Can I compare GPT-OSS 120B and Qwen3.5 Flash on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.

Why does this comparison show “coming soon”?

BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.

What data is available for GPT-OSS 120B and Qwen3.5 Flash today?

GPT-OSS 120B: $0.00 input / $0.00 output per 1M tokens Qwen3.5 Flash: Pricing unavailable Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.

Last updated: March 31, 2026

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