+
+
+
+
+
+
+
+
VS
VS
VS
VS
VS
VS
GPT-5.1 vs o3
Comprehensive side-by-side LLM comparison
GPT-5.1 leads with 6.5% higher average benchmark score. Overall, GPT-5.1 is the stronger choice for coding tasks.
+
+
+
+
OpenAI
GPT-5.1, released by OpenAI in November 2025, is a large language model from the GPT-5 family that delivers incremental improvements in reasoning, instruction following, and multimodal understanding over GPT-5. It features a 400K token context window and targets general-purpose development, long-context analysis, and agentic workflows.
+
+
+
+
OpenAI
OpenAI o3, released by OpenAI in April 2025, is a large reasoning model that applies extended chain-of-thought processing to deliver improved performance on complex math, science, and coding tasks. It features a 200K token context window and native image understanding, with demonstrated strong results on mathematics and software engineering benchmarks. o3 targets demanding analytical and engineering tasks where deliberate, multi-step reasoning produces significantly better outcomes than direct generation.
6 months newer
o3
OpenAI
2025-04-16
GPT-5.1
OpenAI
2025-11
Performance Metrics
Context window and performance specifications
Average performance across 3 common benchmarks
+
+
+
+
GPT-5.1
Average Score:69.5%(+6.5%)
+
+
+
+
o3
Average Score:63.0%
Performance comparison across key benchmark categories
+
+
+
+
GPT-5.1
Science88.1%(+19.0%)
Multimodal76.0%
Tool Use44.5%(+0.9%)
+
+
+
+
Provider Availability & Performance
Available providers and their performance metrics
+
+
+
+
GPT-5.1
0 providers
+
+
+
+
o3
1 providers
OpenAI
+
+
+
+
GPT-5.1
Avg Score:69.5%(+6.5%)
Providers:0
+
+
+
+
o3
Avg Score:63.0%
Providers:1