GPT API Free
Free API keys for ChatGPT, DeepSeek, Claude, Gemini, Grok, and more.
A generous free tier for experimenting with diverse AI models, but limitations in speed and reliability make it unsuitable for production use. Best for prototyping, learning, and comparing model outputs without financial commitment.
- Developers testing multiple AI models side by side
- Hobbyists building prototypes with zero budget
- Students learning AI integration via OpenAI-compatible APIs
- Researchers comparing outputs of different LLMs
- Production applications requiring high reliability and uptime
- Users needing large-scale or frequent API calls
- Enterprise deployments with SLA requirements
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In short
GPT API Free — Free API keys for ChatGPT, DeepSeek, Claude, Gemini, Grok, and more. Best for Developers testing multiple AI models side by side, Hobbyists building prototypes with zero budget, Students learning AI integration via OpenAI-compatible APIs. Free to start; paid plans from $5100/mo.
What independent users actually report about GPT API Free
We ran a structured research pass across product reviews, community discussions, and post-purchase forum threads to surface the patterns vendors won't publish themselves. Below: the recurring strengths, the hidden costs people mention most, and the cohort that consistently regrets adopting this tool.
48 mentions across 4 sources (YouTube, Bluesky, GitHub, Lemmy).
- +Free access to multiple top LLMs including GPT-4 and Claude.
- +Compatible with OpenAI libraries, making integration straightforward.
- +No credit card required to get started initially.
- +Active GitHub community with nearly 39k stars and frequent updates.
- +Supports chat completions and embeddings out of the box.
- −Free keys often show 'insufficient balance' or require payment to use.
- −Frequent API key authentication errors reported on GitHub.
- −Paid users report keys not working with no effective support.
- −Rate limits and availability constraints not clearly documented.
- −Some users label the service a scam due to hidden payment demands.
- • Deposit or payment method required to actually use API beyond initial test calls
- • Potential charges if using paid key features after free tier limits hit
Viability Score
How likely is GPT API Free to still be operational in 12 months? Based on 4 signals — momentum (how recently it shipped), wrapper dependency, revenue model, and web presence.
Last calculated: July 2026
How we score →Key Features
- Free API access to GPT-4 and GPT-3.5
- Free API access to DeepSeek models
- Free API access to Claude models
- Free API access to Gemini models
- Free API access to Grok models
- OpenAI-compatible API endpoints
- No credit card required
- Supports chat completions and embeddings
- Rate-limited free tier
- 14-day query history with up to 10,000 records
- Host options: api.chatanywhere.tech and api.chatanywhere.org
About GPT API Free
GPT API Free provides free API keys for leading large language models including ChatGPT, DeepSeek, Claude, Gemini, and Grok. It is designed for developers and AI enthusiasts who want to experiment with or integrate multiple AI models without incurring costs. The service offers a straightforward API endpoint that works with standard OpenAI-compatible libraries, making it easy to switch between models. What sets it apart is the breadth of models available for free, though with rate limits and potential availability constraints. The platform also offers paid upgrades with discounts for bulk purchases: a 5% discount on orders over 100 yuan and a 10% discount on orders over 1000 yuan. It supports chat completions and embeddings, with query history for up to 14 days and 10,000 records. Host options include api.chatanywhere.tech and api.chatanywhere.org. Compared to other free API providers like Agnes AI (which offers multimodal support), GPT API Free focuses on text-based models but covers a wider range of popular LLMs.
Behind the Verdict
We'd reach for this when we need to quickly test a handful of different models without setting up multiple accounts or paying upfront. The OpenAI-compatible API makes integration trivial if you're already using the OpenAI SDK. Where it bites: rate limits and uptime aren't guaranteed — don't rely on it for anything time-sensitive. The paid tiers with volume discounts are reasonably priced, but the lack of disclosed pricing details for higher usage caps is frustrating. Compared to Agnes AI's free multimodal API, GPT API Free lacks image/video input but offers a broader selection of text models. If you're a student building a prototype or a researcher comparing model outputs, this is a solid starting point. Just don't expect enterprise-grade reliability or support.
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Use Cases
- Prototype a multi-model chatbot without upfront costs
- Compare responses from GPT-4 and Claude side by side
- Integrate free LLM access into educational projects
- Test compatibility of your code with different model APIs
- Build a demo for a hackathon using several AI models
Models Under the Hood
as of 2026-07-15
Limitations
- Rate limits are enforced and may be restrictive for heavy use.
- Context window sizes and model availability can change without notice.
- The service is not guaranteed to be always available and may throttle or block excessive usage.
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
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