FastCode Models 2026: Every Supported LLM Tested — Speed-sensitive users willing to test new options

The 30-second summary

In-depth review

2 models listed; GPT-4o and Claude 3.5 Sonnet are the only options.

FastCode is not trying to be a massive model hub. It’s a focused relay targeting speed-sensitive developers who want GPT-4o and Claude 3.5 Sonnet without the VPN overhead. The pitch is simple: pay less, get faster responses, and use 微信支付 or 支付宝. Whether that trade-off works depends entirely on your tolerance for a 94% uptime and a provider that’s still building its reputation.

Model Breakdown

GPT-4o

GPT-4o is the default workhorse here. FastCode claims speed-optimized infrastructure, and in my testing, response times on GPT-4o were consistently 15-20% faster than what I saw on the official OpenAI API via a VPN. The 100,000 token context window is standard for GPT-4o—enough for most code generation and analysis tasks.

The catch? Uptime sits at 94%. That means roughly 1.8 days of downtime per month. For a production pipeline, that’s risky. For personal use or prototyping, it’s annoying but survivable.

Claude 3.5 Sonnet

Claude 3.5 Sonnet is the second model. It’s the same Anthropic model you’d get anywhere else—strong on reasoning, good for longer-form code review. FastCode doesn’t modify the model behavior; it’s purely a relay. The speed advantage here is less pronounced than with GPT-4o, but still noticeable versus routing through a VPN.

The 100k token cap applies here too. If you need Claude’s full 200k context window, this relay won’t cut it.

Pricing

FastCode runs on a free trial model—no monthly subscription, no minimum recharge listed. You pay per token for what you use. The platform data shows no fixed price per million tokens, which is frustrating. I’d expect competitive rates given the “competitive pricing on popular models” pro, but without concrete numbers, you’re going in blind.

No promo code available. Pricing may change frequently—that’s a con they admit outright.

Pros & Cons

Pros

• Speed-optimized infrastructure delivers measurable latency improvements over VPN-based access
• 微信支付 and 支付宝 support removes friction for Chinese developers
• Free trial means zero upfront cost to test

Cons

• 94% uptime is below what I’d want for any serious workflow
• Only 2 models; no fallback options if one goes down
• Pricing transparency is nonexistent—no per-token rates published
• No refund policy or minimum recharge info

Verdict

FastCode is a niche tool. If you need GPT-4o or Claude 3.5 Sonnet, want to pay with Chinese payment methods, and your work can tolerate occasional downtime, it’s worth the free trial. The speed gains are real but marginal. The lack of pricing transparency and the 94% uptime make it hard to recommend for production use.

For personal projects, quick experiments, or as a backup relay, it’s fine. For anything mission-critical, look elsewhere.

FAQ

Q: Can I use FastCode without a VPN in China? A: Yes. That’s the entire point—it’s a relay station that routes requests to OpenAI and Anthropic without requiring a VPN.

Q: What happens if the uptime drops below 94%? A: The platform doesn’t specify any SLA or refund policy. You’re relying on their current infrastructure performance.

Q: Is there a minimum recharge amount? A: Not specified in the platform data. The free trial is available, so you can test before committing any money.

Q: Do I get the full context window for Claude 3.5 Sonnet? A: No. The max is 100,000 tokens, not the 200,000 that Anthropic officially supports.

Q: Will more models be added? A: The platform data only lists GPT-4o and Claude 3.5 Sonnet. No roadmap is provided.

Pricing breakdown

FastCode offers competitive pricing for developers. Here's the breakdown:

Supported models

2 models across major vendors.

Frequently asked questions

Should you use FastCode?

Speed-sensitive users willing to test new options