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openai/gpt-oss-20b

LM-STUDIO MLX

gpt_oss · 20B · MXFP4

Not Rec.

Sep 29, 2026 · Apple M5 Max

qwen3.5:4b

OLLAMA GGUF

qwen35 · 4.2B · Q4_K_M

Excellent

Oct 12, 2026 · AMD Ryzen 5 5500

Global Score
83 vs 81
Hardware Fit
80 vs 98
Quality Score
84 vs 74

Hardware

openai/gpt-oss-20b qwen3.5:4b
MachineMacBook ProMicrosoft WSL
CPUApple M5 MaxAMD Ryzen 5 5500
Cores1812
RAM128 GB8 GB
GPUApple M5 MaxIntegrated / Unknown
OSmacOS 26.6.2Ubuntu 26.04.1 LTS
Archarm64x64
Power Modebalancedunknown

Performance

openai/gpt-oss-20b qwen3.5:4b
Tokens/sec138.493.7
First chunk3 ms249 ms
TTFT30.0 s249 ms
Load time6.8 s10.1 s
Memory usage0.5 GB2.9 GB
Memory %0%38%

HW Fit Score Breakdown

openai/gpt-oss-20b

Speed
50/50
TTFT
0/20
Memory
30/30

qwen3.5:4b

Speed
50/50
TTFT
20/20
Memory
28/30

Quality

openai/gpt-oss-20b

Reasoning
18/20
Coding
12/20
Instruction
15/20
Structured
14/15
Math
15/15
Multilingual
10/10
Reasoning: Strong Coding: Adequate Instruction Following: Strong Structured Output: Strong Math: Strong Multilingual: Strong

qwen3.5:4b

Reasoning
15/20
Coding
13/20
Instruction
15/20
Structured
15/15
Math
7/15
Multilingual
9/10
Reasoning: Strong Coding: Adequate Instruction Following: Strong Structured Output: Strong Math: Weak Multilingual: Strong
View openai/gpt-oss-20b details | View qwen3.5:4b details

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