+
+
+
+
+
+
+
+
VS
VS
VS
VS
VS
VS
GPT-5.1 Instant vs GPT-5.3 Codex
Comprehensive side-by-side LLM comparison
GPT-5.1 Instant supports multimodal inputs. Both models have their strengths depending on your specific coding needs.
+
+
+
+
OpenAI
GPT-5.1 Instant, released by OpenAI in November 2025, is a low-latency variant from the GPT-5.1 family optimized for fast response times and high-throughput workloads. It targets real-time applications, conversational assistants, and production APIs where response speed is a primary requirement alongside GPT-5.1-generation reasoning quality.
+
+
+
+
OpenAI
GPT-5.3 Codex, released by OpenAI in February 2026, is a coding-specialized large language model from the GPT-5.3 family. It targets software engineering workflows including automated code generation, test writing, and agentic multi-file editing, built on the incremental improvements of the GPT-5.3 generation.
3 months newer
GPT-5.1 Instant
OpenAI
2025-11
GPT-5.3 Codex
OpenAI
2026-02
Provider Availability & Performance
Available providers and their performance metrics
+
+
+
+
GPT-5.1 Instant
0 providers
+
+
+
+
GPT-5.3 Codex
0 providers
+
+
+
+
GPT-5.1 Instant
Avg Score:0.0%
Providers:0
+
+
+
+
GPT-5.3 Codex
Avg Score:0.0%
Providers:0