Proprietary AI models: API-only, and what that locks you into
| # | AI model | Capabilities | API $/1M (in / out) | Context window | Price / mo | Output $/1M | Overview | Visit site |
|---|---|---|---|---|---|---|---|---|
| 1 |  Claude Fable 5.1 Anthropic |    | $10 / $50 | 1M tokens | API only | 50 | View | |
| 2 |  GPT-6 Astra OpenAI | | $10 / $50 | 1.05M tokens | API only | 50 | View | |
| 3 | GPT-6.1 Sol OpenAI | | $2 / $10 | 1.05M tokens | API only | 10 | View | |
| 4 | GPT-6 Sol OpenAI | | $2 / $10 | 1.05M tokens | API only | 10 | View | |
| 5 | GPT-6 Luna OpenAI | | $0.1 / $0.5 | 1.05M tokens | API only | 0.5 | View | |
| 6 | Claude Opus 5.5 Anthropic | | $4 / $20 | 1M tokens | API only | 20 | View | |
| 7 | Claude Sonnet 5.5 Anthropic | | $2 / $10 | 1M tokens | API only | 10 | View | |
| 8 |  Grok 4.7 xAI | | $2 / $6 | 500K tokens | API only | 6 | View | |
| 9 |  Qwen3.8 Max Prime Qwen |  | $3.36 / $10.08 | 1M tokens | API only | 10.08 | View | |
| 10 |  GLM 5.3 FlashX Z.ai |  | $0.37 / $1.25 | 1M tokens | API only | 1.25 | View | |
| 11 |  Ember-1 Fireworks AI | | $3 / $15 | 1.04M tokens | API only | 15 | View | |
| 12 | Claude Opus 5 Anthropic | | $5 / $25 | 1M tokens | API only | 25 | View | |
| 13 | Claude Fable 5 Anthropic | | $10 / $50 | 1M tokens | API only | 50 | View | |
| 14 | GPT-5.6 Sol OpenAI | | $4 / $20 | 1.05M tokens | API only | 20 | View | |
| 15 | Grok 4.6 xAI | | $2 / $6 | 500K tokens | API only | 6 | View | |
| 16 | GPT-5.6 Terra OpenAI | | $2 / $12 | 1.05M tokens | API only | 12 | View | |
| 17 | Claude Opus 4.8 Anthropic | | $5 / $25 | 1M tokens | API only | 25 | View | |
| 18 |  Gemini 3.8 Flash Google |  | $0.75 / $3.75 | 1.05M tokens | API only | 3.75 | View | |
| 19 |  Muse Spark 1.2 Meta | | $1.25 / $4.25 | 1.05M tokens | API only | 4.25 | View | |
| 20 | Gemini 3.7 Flash Google | | $0.75 / $3.75 | 1.05M tokens | API only | 3.75 | View |
Browse by need
These 151 models are available only through the vendor own API: no weights to download, no self-hosting, no fine-tuning beyond what the vendor exposes. In exchange you get no infrastructure to run and immediate access to whatever ships next.
Prices run from $0.87 to $50 per million output tokens. The frontier tier is entirely proprietary - GPT-6 Astra, Claude Fable 5.1, Claude Opus 5 - and that gap is the honest argument for closed models. The arguments against are equally practical: pricing changes without your consent, models get retired on the vendor schedule, and your data leaves your perimeter.
Models with this capability
The 151 models below all support this capability. Prices are input and output per 1M tokens from the vendor official price list; for dirhams multiply by 3.6725. Tap a card to open the model page.
How to choose
- Check the deprecation policy before building on a specific model version.
- Pin snapshot versions where the vendor offers them, rather than floating aliases.
- Read the data-retention terms if you handle personal or regulated information.
- Keep an open-weight fallback identified, even if you never use it.
Common mistakes
Who this suits
Related filters
Frequently asked questions
Why choose a closed model?
What are the risks?
What is the open alternative?
Can I fine-tune a proprietary model?
What happens when a model retires?
Frequently searched
Rate this page
Help us improve