Anthropic API vs Resend
API for Claude — frontier models for chat, tool use, agents, and long-context reasoning
vs. The email API for developers — built by the Nodemailer team
Pricing tiers
Anthropic API
Opus 4.7 — usage
Input $5 / output $25 / cache-write $6.25 / cache-read $0.50 per 1M tokens. Batch = 50% off.
Custom
Sonnet 4.6 — usage
Input $3 / output $15 / cache-write $3.75 / cache-read $0.30 per 1M tokens. Batch = 50% off.
Custom
Haiku 4.5 — usage
Input $1 / output $5 / cache-write $1.25 / cache-read $0.10 per 1M tokens. Batch = 50% off.
Custom
Resend
Free
3,000 emails/month, 100 emails/day. 1 custom domain. Ideal for side projects.
Free
Pro — 50k
50,000 emails/month. 10 custom domains. Priority support.
$20/mo
Pro — 100k
100,000 emails/month. 10 custom domains.
$35/mo
Scale — 100k+
Tiered from 100k → 2.5M emails/month. Dedicated IP add-on available.
$90/mo
Scale — 2.5M
2.5M emails/month.
$1150/mo
Enterprise
3M+/month, dedicated IP included, SSO, custom contract.
Custom
Free-tier quotas head-to-head
Comparing opus-4-7 on Anthropic API vs free on Resend.
| Metric | Anthropic API | Resend |
|---|---|---|
| custom domains | — | 1 domains |
| discount batch | 50 % off | — |
| emails per day | — | 100 emails/day |
| emails per month | — | 3000 emails/month |
Features
Anthropic API · 0 features
Resend · 12 features
- Audiences — Contact list management with custom fields.
- Batch Send — Send up to 100 emails in one API call.
- Broadcasts — Bulk email campaigns with audiences, A/B testing, analytics.
- Dedicated IP — Add-on for high-volume senders. Auto warmup.
- Domains — DKIM/SPF/DMARC auto-verification. Per-domain analytics.
- Idempotency — Prevent duplicate sends with Idempotency-Key header.
- Logs + Analytics — Full email logs, delivery heatmap, events table.
- React Email — OSS library (3M+ downloads) to compose emails in React/JSX.
- Scheduled Send — scheduledAt parameter for future delivery.
- Send API — POST /emails endpoint to send. Supports attachments, scheduled send, idempotency…
- Suppressions — Auto-managed bounce + complaint list. API to add/remove.
- Webhooks — Email lifecycle events: sent, delivered, bounced, complained, opened, clicked.
Developer interfaces
| Kind | Anthropic API | Resend |
|---|---|---|
| CLI | Claude Code CLI | Resend CLI |
| SDK | Go SDK, Java SDK, Python SDK, Ruby SDK, TypeScript SDK (@anthropic-ai/sdk) | react-email, resend-go, resend-node, resend-php, resend-python, resend-ruby |
| REST | AWS Bedrock, Google Vertex AI, Microsoft Azure AI, REST API (Messages + Agents) | Resend REST API |
| OTHER | — | SMTP Relay, Webhooks (Svix) |
Staxly is an independent catalog of developer platforms. Outbound links to Anthropic API and Resend are plain references to their official websites. Pricing is verified against vendor pages at publication time — reconfirm before buying.
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