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GPT-5.2 vs Step-3.5-Flash
Comprehensive side-by-side LLM comparison
GPT-5.2 leads with 5.6% higher average benchmark score. GPT-5.2 supports multimodal inputs. Overall, GPT-5.2 is the stronger choice for coding tasks.
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OpenAI
GPT-5.2, released by OpenAI on December 11, 2025, is a large language model from the GPT-5 family that improves on GPT-5 in general intelligence, long-context understanding, agentic tool-calling, and vision. It features a 400K token context window, 128K maximum output tokens, and a knowledge cutoff of August 2025. GPT-5.2 targets long-context coding tasks, extended document analysis, and complex agentic workflows requiring reliable instruction following.
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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.
1 month newer
GPT-5.2
OpenAI
2025-12-11
Step-3.5-Flash
StepFun
2026-02-02
Average performance across 1 common benchmarks
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GPT-5.2
Average Score:80.0%(+5.6%)
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Step-3.5-Flash
Average Score:74.4%
Performance comparison across key benchmark categories
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GPT-5.2
Coding80.0%(+5.6%)
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Step-3.5-Flash
Coding74.4%
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Knowledge Cutoff
Training data recency comparison
GPT-5.2
2025-08
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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GPT-5.2
0 providers
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Step-3.5-Flash
0 providers
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GPT-5.2
Avg Score:80.0%(+5.6%)
Providers:0
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Step-3.5-Flash
Avg Score:74.4%
Providers:0