# GLM 5.3 Flash vs GPT-5.6 Luna

As of Oct 15, 2026, GLM 5.3 Flash leads GPT-5.6 Luna in 8 of 10 shared categories: General LLM, Reasoning, Coding, Coding › Agentic, Coding › Web dev, Long context, Factuality, and Abstraction (ARC).

GLM 5.3 Flash: $0.2375 per 1M blended tokens.

GPT-5.6 Luna: $0.44999999999999996 per 1M blended tokens.

GLM 5.3 Flash: open weights.

GPT-5.6 Luna: closed weights.

- Which to pick, General LLM: As of Oct 15, 2026, GLM 5.3 Flash leads GPT-5.6 Luna in General LLM at #34 against #66.
- Which to pick, Reasoning: As of Oct 15, 2026, GLM 5.3 Flash leads GPT-5.6 Luna in Reasoning at #27 against #69.
- Which to pick, Science: As of Oct 15, 2026, GPT-5.6 Luna leads GLM 5.3 Flash in Science at #25 against #34.
- Which to pick, Coding: As of Oct 15, 2026, GLM 5.3 Flash leads GPT-5.6 Luna in Coding at #10 against #16.
- Which to pick, Coding › Agentic: As of Oct 15, 2026, GLM 5.3 Flash leads GPT-5.6 Luna in Coding › Agentic at #10 against #16.
- Which to pick, Coding › Web dev: As of Oct 15, 2026, GLM 5.3 Flash leads GPT-5.6 Luna in Coding › Web dev at #24 against #46.
- Which to pick, Long context: As of Oct 15, 2026, GLM 5.3 Flash leads GPT-5.6 Luna in Long context at #35 against #80.
- Which to pick, Vision: As of Oct 15, 2026, GPT-5.6 Luna leads GLM 5.3 Flash in Vision at #19 against #29.
- Which to pick, Factuality: As of Oct 15, 2026, GLM 5.3 Flash leads GPT-5.6 Luna in Factuality at #34 against #39.
- Which to pick, Abstraction (ARC): As of Oct 15, 2026, GLM 5.3 Flash leads GPT-5.6 Luna in Abstraction (ARC) at #14 against #19.

As of Oct 15, 2026, GLM 5.3 Flash is state of the art on best per dollar in Coding (since Oct 14, 2026; sources Terminal-Bench 4.0; methodology v1.0).

As of Oct 15, 2026, GPT-5.6 Luna is ranked #16 in Coding (since Oct 15, 2026; sources Terminal-Bench 4.0; methodology v1.0).