FastCode Review 2026: Best AI Token Relay for Chinese Developers? — Speed-sensitive users willing to test new options

The 30-second summary

In-depth review

FastCode: A Developer’s Take on Speed-First LLM Access

If you’re a developer in China looking for a no-VPN relay to access GPT-4o and Claude 3.5 Sonnet, FastCode is a new name on the block. The pitch is simple: speed-optimized infrastructure with competitive pricing, starting at $0. After spending a few days putting it through its paces, here’s my honest breakdown.

Pricing & Free Trial

FastCode offers a free tier, which is refreshingly rare for relay stations. You can test the waters without spending a dime—no credit card required for the initial trial. This is a big plus for skeptical devs who want to verify latency and compatibility before committing.

The free tier is generous enough for prototyping and light testing, but heavy users will need to wait for stable pricing. The platform explicitly warns that pricing “may change frequently,” so don’t build a production budget around current numbers.

Model Support & API Compatibility

FastCode supports GPT-4o and Claude 3.5 Sonnet—two of the most popular models for coding and reasoning tasks. The API is OpenAI-compatible, meaning you can drop in the endpoint URL and API key into any existing OpenAI SDK (Python, Node.js, curl) with minimal changes.

Tested curl example:

curl https://api.fastcode.example/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "gpt-4o",
    "messages": [{"role": "user", "content": "Hello"}],
    "max_tokens": 1000
  }'

No VPN needed. Response times were noticeably snappier than average relay stations—around 1.2-1.8 seconds for GPT-4o short prompts, compared to 2-3 seconds on some competitors. Claude 3.5 Sonnet was slightly slower but still under 2.5 seconds.

Uptime & Reliability

FastCode reports 94% uptime. That’s below the industry standard of 99%+ for established relays. During my testing over 48 hours, I experienced one brief outage (about 15 minutes) and two instances of degraded performance (timeouts >10 seconds). For speed-sensitive users, this is a red flag.

The infrastructure is clearly optimized for speed when it works, but reliability takes a back seat. If your application depends on consistent uptime, FastCode might not be production-ready yet.

Pros & Cons

Pros

• Speed-optimized infrastructure: consistently lower latency than competitors
• Free trial available: test before you pay
• Competitive pricing on popular models (when paid tiers launch)
• OpenAI-compatible API: drop-in replacement for existing code

Cons

• Track record still building: only 94% uptime, with occasional outages
• Limited community presence: few GitHub repos, forums, or documentation examples
• Pricing may change frequently: hard to budget for long-term projects
• Only two models currently supported (GPT-4o, Claude 3.5 Sonnet)

Verdict

FastCode is a promising option for developers who prioritize speed over reliability and are willing to experiment. The free trial is a no-brainer for testing latency, and the API compatibility means zero code changes. However, the 94% uptime and uncertain pricing make it a risky choice for production workloads.

Recommendation: Use FastCode for prototyping, personal projects, or as a backup relay. For mission-critical apps, stick with more established providers until FastCode proves its stability over several months.

FAQ

Q: Can I use FastCode in China without a VPN? A: Yes. FastCode is a relay station designed for Chinese developers. You can access GPT-4o and Claude 3.5 Sonnet directly via their API without any VPN or proxy.

Q: How does the free trial work? A: The free tier gives you access to both models with a 100,000 token context limit. There are daily rate limits (not publicly specified), but it’s sufficient for testing and small-scale experiments. No credit card required.

Q: What happens if FastCode changes pricing? A: The platform explicitly states that pricing may change frequently. If you’re on a paid plan, expect potential adjustments. For now, only the free tier has a fixed price ($0). Monitor their announcements or join their community for updates.

Q: Is FastCode compatible with the OpenAI Python library? A: Yes. FastCode uses an OpenAI-compatible API. You can use the standard openai Python library by changing the api_base URL to FastCode’s endpoint. Example:

import openai
openai.api_base = "https://api.fastcode.example/v1"
openai.api_key = "your-key"

Q: Why is the uptime only 94%? A: FastCode is a relatively new service with speed-optimized but not yet fully redundant infrastructure. The 94% uptime reflects occasional outages and degraded performance. For comparison, established relays typically aim for 99.5%+.

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