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GPT-5.2 Codex vs Step-3.5-Flash
Comprehensive side-by-side LLM comparison
. Both models have their strengths depending on your specific coding needs.
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OpenAI
GPT-5.2 Codex is a coding-specialized variant from the GPT-5.2 family, designed for software engineering workflows including automated code generation, multi-file editing, and agentic development. It builds on GPT-5.2's improved instruction following and long-context capabilities, with optimizations specifically targeting programming tasks and agentic software workflows.
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StepFun
Step-3.5-Flash, released by StepFun on February 2, 2026, is a Mixture-of-Experts large language model with 197 billion total parameters and approximately 11 billion active parameters per inference. It features a 256K token context window using a 3:1 sliding-window-to-full-attention ratio, processing 100–350 tokens per second. Step-3.5-Flash targets agentic tasks, coding workflows, and open-source deployments requiring frontier reasoning capabilities with efficient inference, under an Apache 2.0 license.
19 days newer
GPT-5.2 Codex
OpenAI
2026-01-14
Step-3.5-Flash
StepFun
2026-02-02
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.2 Codex
0 providers
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Step-3.5-Flash
0 providers
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GPT-5.2 Codex
Avg Score:0.0%
Providers:0
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Step-3.5-Flash
Avg Score:0.0%
Providers:0