Union Alpha alternatives
Ranked by capability overlap, similar context window, and similar price tier. Cross-vendor options are weighted higher than same-provider alternatives.
See also: Union Alpha model details · Stealth provider page
Top 15 alternatives
| # | Model | Provider | Why | Context | Input price / 1M | Compare |
|---|---|---|---|---|---|---|
| 1 | Google: Gemma 4 26B A4B | shares tool-use, structured-output, vision · similar price tier | 262K Long context (128K+) | $0.09 Budget | vs → | |
| 2 | Google: Gemma 4 31B | shares tool-use, structured-output, vision · similar price tier | 262K Long context (128K+) | $0.09 Budget | vs → | |
| 3 | Google: Gemma 4 31B (batch) | shares tool-use, structured-output, vision · similar price tier | 262K Long context (128K+) | $0.39 Budget | vs → | |
| 4 | Qwen: Qwen3 VL 30B A3B Instruct | Qwen | shares tool-use, structured-output, vision · similar price tier | 262K Long context (128K+) | $0.13 Budget | vs → |
| 5 | Qwen: Qwen3 VL 8B Instruct | Qwen | shares tool-use, structured-output, vision · similar price tier | 262K Long context (128K+) | $0.12 Budget | vs → |
| 6 | Mistral: Ministral 3 14B 2512 | Mistral AI | shares tool-use, structured-output, vision · similar price tier | 262K Long context (128K+) | $0.20 Budget | vs → |
| 7 | Mistral: Ministral 3 8B 2512 | Mistral AI | shares tool-use, structured-output, vision · similar price tier | 262K Long context (128K+) | $0.15 Budget | vs → |
| 8 | Mistral: Ministral 3 8B 2512 (batch) | Mistral AI | shares tool-use, structured-output, vision · similar price tier | 262K Long context (128K+) | $0.07 Budget | vs → |
| 9 | Mistral: Mistral Large 3 2512 (batch) | Mistral AI | shares tool-use, structured-output, vision · similar price tier | 262K Long context (128K+) | $0.25 Budget | vs → |
| 10 | Mistral: Mistral Small 3.2 24B | Mistral AI | shares tool-use, structured-output, vision · similar price tier | 256K Long context (128K+) | $0.09 Budget | vs → |
| 11 | Mistral: Mistral Small 4 | Mistral AI | shares tool-use, structured-output, vision · similar price tier | 262K Long context (128K+) | $0.15 Budget | vs → |
| 12 | Mistral: Mistral Small 4 (batch) | Mistral AI | shares tool-use, structured-output, vision · similar price tier | 262K Long context (128K+) | $0.07 Budget | vs → |
| 13 | OpenAI: GPT-5 Mini | OpenAI | shares tool-use, structured-output, vision · similar price tier | 400K Long context (128K+) | $0.25 Budget | vs → |
| 14 | OpenAI: GPT-5 Mini (batch) | OpenAI | shares tool-use, structured-output, vision · similar price tier | 400K Long context (128K+) | $0.13 Budget | vs → |
| 15 | OpenAI: GPT-5 Nano | OpenAI | shares tool-use, structured-output, vision · similar price tier | 400K Long context (128K+) | $0.05 Budget | vs → |