+
+
+
+
+
+
+
+
VS
VS
VS
VS
VS
VS
GPT-5.1 Codex Max vs o1
Comprehensive side-by-side LLM comparison
o1 supports multimodal inputs. Both models have their strengths depending on your specific coding needs.
+
+
+
+
OpenAI
GPT-5.1 Codex Max, released by OpenAI in November 2025, is an enhanced coding variant from the GPT-5.1 Codex line, designed for more complex software engineering tasks requiring additional reasoning depth. It targets large-scale code generation, automated refactoring, and sophisticated agentic development workflows.
+
+
+
+
OpenAI
OpenAI o1, released by OpenAI in December 2024, is a reasoning-focused large language model that applies extended chain-of-thought processing before generating responses. It features a 200K token context window and native image understanding, demonstrating strong performance on STEM benchmarks requiring multi-step reasoning. o1 targets mathematics, science, and coding tasks where careful deliberation over the problem produces more accurate outputs than direct generation.
11 months newer
o1
OpenAI
2024-12-05
GPT-5.1 Codex Max
OpenAI
2025-11
Performance Metrics
Context window and performance specifications
+
+
+
+
Knowledge Cutoff
Training data recency comparison
o1
2023-10
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
+
+
+
+
GPT-5.1 Codex Max
0 providers
+
+
+
+
o1
1 providers
OpenAI
+
+
+
+
GPT-5.1 Codex Max
Avg Score:0.0%
Providers:0
+
+
+
+
o1
Avg Score:0.0%
Providers:1