Claude's global reach — a tighter circle than ChatGPT
Anthropic's official supported-country list is ~150, narrower than OpenAI's 180+. Notable exclusions: mainland China (double-blocked), Russia, India (only opened in 2024), Vietnam, Thailand (some ASNs blocked), parts of Brazil. In late 2024 Anthropic tightened 'login from non-supported country' handling — API keys are revoked rather than just request-denied as OpenAI does. That makes Claude less forgiving of VPN users: once triggered, the recovery path is longer. The stablest pattern for overseas Chinese users: US / JP / SG native residential IP, no frequent region flipping.
Claude's anti-VPN — Cloudflare + CloudFront double layer
Anthropic fronts with Cloudflare + CloudFront for model API — one more VPN-detection layer than ChatGPT. Cloudflare edge does IP-reputation gating and challenges datacenter IPs (similar to ChatGPT), while api.anthropic.com sits on CloudFront, and it aggressively flags traffic originating from other CloudFront ranges (many VPNs exit through AWS) — it can detect CloudFront-to-CloudFront loops. Practical fixes: avoid AWS / Lightsail / DigitalOcean US exits; prefer non-AWS residential or Tier-1 network VPNs. Also enable global DNS-over-HTTPS (Cloudflare 1.1.1.1) to reduce leak risk.
AF3 node recommendations — pickier about IP than ChatGPT
AF3 scores Claude at 1-star overall but weighs IP-type slightly higher than for ChatGPT. Recommended: (1) Residential IP + US-West (Anthropic's deploy is US-West-heavy, <100ms RTT); (2) Tokyo residential (50–80ms, stable); (3) Singapore residential (best for SEA). Avoid: Hong Kong (not in Anthropic's supported list), Vietnam, certain Thai ASNs. Transport: Hysteria2 / Reality for GFW. Pure datacenter VPN is not recommended — 403 rate is noticeably higher than ChatGPT. If you're in China, test 5 small queries before upgrading to Pro — confirm account stability before spending.
Claude Pro / Team / Enterprise — which tier to pick
Claude's consumer tiers: Free (Sonnet 3.7, heavy rate limits), Pro ($20/mo — higher limits + Opus access + Projects), Team ($25/user/mo, minimum 5 seats, collaborative Projects). Enterprise is sales-contact-only with SSO and private-deployment options. Pro vs ChatGPT Plus: (1) Claude Opus is now the 1M-token-context king for long codebases and long documents; (2) Projects is stronger for knowledge-base workflows; (3) No image gen (no DALL-E equivalent), no audio. For coding and long-document users, Claude Pro wins; for daily Q&A and multimodal, ChatGPT Plus is more balanced.
Model picks — Opus vs Sonnet vs Haiku
Three lines: Opus (most capable — deep thinking, slow output, expensive tokens), Sonnet (workhorse — speed/quality balance, optimal for most tasks), Haiku (fastest and cheapest — simple tasks and batch). 2026 codename is Claude 4.7 — Opus 4.7 leads on code, complex reasoning, long documents; Sonnet 4.7 is the daily-productivity default; Haiku 4.5 for batch summarization and classification. API pricing: Opus $15/Mtoken input, $75/Mtoken output; Sonnet $3/$15; Haiku $0.8/$4. Pro's Opus access has a daily message cap (far below what $20/mo in API credit would buy). For enterprise / multi-task workloads, pay-as-you-go API Credit is cheaper.
Account security and ban patterns
Claude ban triggers are similar to ChatGPT but with a twist: (1) short-window multi-country logins — Anthropic is more sensitive than OpenAI and revokes API keys rather than just demanding a captcha; (2) prohibited content — Anthropic's content policy is visibly stricter than OpenAI's (safety research, CSAM, malicious code are all refused); (3) account sharing — 3+ simultaneous devices triggers risk gating; (4) payment disputes — a credit card chargeback leads straight to account suspension. Appeals via [email protected] or support, but reinstatement rate is <20%. Signup best practice: lock in a stable phone, email, and payment method. Once an API key is revoked, re-applying on the same email can be denied — in severe cases you need to fully re-enroll.