+
+
+
+
+
+
+
+
VS
VS
VS
VS
VS
VS
GPT-4.1 vs Step-3.5-Flash
Comprehensive side-by-side LLM comparison
GPT-4.1 supports multimodal inputs. Both models have their strengths depending on your specific coding needs.
+
+
+
+
OpenAI
GPT-4.1, released by OpenAI in April 2025, is a large language model from the GPT-4 family optimized for coding, precise instruction following, and long-context tasks. It features a 1M token context window and native image understanding, with improved performance on tool-calling and web development benchmarks compared to GPT-4o. GPT-4.1 targets software development workflows, long-document analysis, and applications requiring accurate, instruction-adherent outputs.
+
+
+
+
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.
9 months newer
GPT-4.1
OpenAI
2025-04-14
Step-3.5-Flash
StepFun
2026-02-02
Performance Metrics
Context window and performance specifications
Provider Availability & Performance
Available providers and their performance metrics
+
+
+
+
GPT-4.1
1 providers
OpenAI
+
+
+
+
Step-3.5-Flash
0 providers
+
+
+
+
GPT-4.1
Avg Score:0.0%
Providers:1
+
+
+
+
Step-3.5-Flash
Avg Score:0.0%
Providers:0