gpt-oss-20b vs OpenAI: GPT-5.1-Codex-Mini

Side-by-side comparison of API pricing, context window, latency, and benchmark performance. Data refreshed daily from provider APIs and ModelStop's own latency probes.

Key Differences

⚡gpt-oss-20b is 20ms faster than OpenAI: GPT-5.1-Codex-Mini

Comparison Overview

Price (lower is better), Speed/Latency (lower is better), Performance (higher is better)

Detailed Comparison

Why choose between them?

gpt-oss-20b: Best value

OpenAI: GPT-5.1-Codex-Mini: Best value • Fastest

Spec	gpt-oss-20b	OpenAI: GPT-5.1-Codex-Mini
Provider	openai	openai
Input price / 1M tokens	Free	Free
Output price / 1M tokens	—	—
Context window	—	400k tokens
Latency (p50)	—	20ms
Best benchmark score	—	—
Open source	No	No

gpt-oss-20b

gpt-oss-20b — available via AWS Bedrock (us-east-1).

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OpenAI: GPT-5.1-Codex-Mini

GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex

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