OpenAI: GPT-5.6 Luna alternatives
Ranked by capability overlap, similar context window, and similar price tier. Cross-vendor options are weighted higher than same-provider alternatives.
See also: OpenAI: GPT-5.6 Luna model details · GPT-5 family · OpenAI provider page
Top 15 alternatives
| # | Model | Provider | Why | Context | Input price / 1M | Compare |
|---|---|---|---|---|---|---|
| 1 | Google: Gemini 2.5 Flash | shares reasoning, tool-use, structured-output, vision · similar price tier | 1.0M Ultra context (1M+) | $0.30 Budget | vs → | |
| 2 | Google: Gemini 2.5 Flash (batch) | shares reasoning, tool-use, structured-output, vision · similar price tier | 1.0M Ultra context (1M+) | $0.15 Budget | vs → | |
| 3 | Google: Gemini 2.5 Flash Lite | shares reasoning, tool-use, structured-output, vision · similar price tier | 1.0M Ultra context (1M+) | $0.10 Budget | vs → | |
| 4 | Google: Gemini 2.5 Flash Lite (batch) | shares reasoning, tool-use, structured-output, vision · similar price tier | 1.0M Ultra context (1M+) | $0.05 Budget | vs → | |
| 5 | Google: Gemini 2.5 Flash Lite Preview 09-2025 | shares reasoning, tool-use, structured-output, vision · similar price tier | 1.0M Ultra context (1M+) | $0.10 Budget | vs → | |
| 6 | Google: Gemini 3 Flash Preview (batch) | shares reasoning, tool-use, structured-output, vision · similar price tier | 1.0M Ultra context (1M+) | $0.25 Budget | vs → | |
| 7 | Google: Gemini 3.1 Flash Lite | shares reasoning, tool-use, structured-output, vision · similar price tier | 1.0M Ultra context (1M+) | $0.25 Budget | vs → | |
| 8 | Google: Gemini 3.1 Flash Lite (batch) | shares reasoning, tool-use, structured-output, vision · similar price tier | 1.0M Ultra context (1M+) | $0.13 Budget | vs → | |
| 9 | Google: Gemini 3.1 Flash Lite Preview | shares reasoning, tool-use, structured-output, vision · similar price tier | 1.0M Ultra context (1M+) | $0.25 Budget | vs → | |
| 10 | Google: Gemini 3.5 Flash Lite | shares reasoning, tool-use, structured-output, vision · similar price tier | 1.0M Ultra context (1M+) | $0.30 Budget | vs → | |
| 11 | Google: Gemini 3.5 Flash Lite (batch) | shares reasoning, tool-use, structured-output, vision · similar price tier | 1.0M Ultra context (1M+) | $0.15 Budget | vs → | |
| 12 | Qwen: Qwen3.5 Plus 2026-02-15 | Qwen | shares reasoning, tool-use, structured-output, vision · similar price tier | 1M Ultra context (1M+) | $0.26 Budget | vs → |
| 13 | Qwen: Qwen3.5 Plus 2026-04-20 | Qwen | shares reasoning, tool-use, structured-output, vision · similar price tier | 1M Ultra context (1M+) | $0.30 Budget | vs → |
| 14 | Qwen: Qwen3.5-Flash | Qwen | shares reasoning, tool-use, structured-output, vision · similar price tier | 1M Ultra context (1M+) | $0.07 Budget | vs → |
| 15 | Qwen: Qwen3.6 Flash | Qwen | shares reasoning, tool-use, structured-output, vision · similar price tier | 1M Ultra context (1M+) | $0.19 Budget | vs → |