Comprehensive side-by-side LLM comparison
GPT-5.1 Instant supports multimodal inputs. Both models have their strengths depending on your specific coding needs.
Zhipu AI
GLM-4.5 Air is a lightweight variant from Zhipu AI's GLM-4 model family, designed for efficient deployments requiring lower inference cost while maintaining strong language understanding and generation capabilities. It targets cost-sensitive production workloads, API integrations, and applications where the full GLM-4.x series capacity exceeds requirements.
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.
3 months newer
GLM-4.5 Air
Zhipu AI
2025-07-28

GPT-5.1 Instant
OpenAI
2025-11
Context window and performance specifications
Available providers and their performance metrics
GLM-4.5 Air
Zhipu AI
GPT-5.1 Instant
GLM-4.5 Air
GPT-5.1 Instant
GLM-4.5 Air
GPT-5.1 Instant