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Anthropic API vs OpenAI API: pricing, quotas & features (2025)

API for Claude — frontier models for chat, tool use, agents, and long-context reasoning
vs. Frontier models: GPT-5, o-series reasoning, image, audio, embeddings

Data sourced from vendor documentation · Last updated May 2026

Anthropic website ↗OpenAI Platform ↗

Summary

Anthropic API and OpenAI API are both ai-api platforms, addressing the same core use case with different implementation philosophies and trade-offs. Both offer a free tier, making it easy to prototype without a credit card. OpenAI API has a broader documented feature set (12 vs 0 features). The right choice depends on your existing stack, team experience, and feature requirements. All pricing and quota data below is sourced from Anthropic API and OpenAI API's official documentation — not generated by AI or estimated.

Anthropic API vs OpenAI API: Comparativa de precios, cuotas y características (2025)

En esta comparativa analizamos Anthropic API y OpenAI API lado a lado — incluyendo precios mensuales, límites del tier gratuito, características técnicas, cuotas de uso (almacenamiento, transferencia, usuarios activos mensuales) y los interfaces de desarrollo disponibles. Todos los datos proceden de la documentación oficial de cada proveedor, no de respuestas generadas por IA.

Anthropic API es una plataforma de la categoría ai-api — API for Claude — frontier models for chat, tool use, agents, and long-context reasoning. Ofrece 3 tiers de precio: Opus 4.7 — usage (personalizado), Sonnet 4.6 — usage (personalizado), Haiku 4.5 — usage (personalizado). Su catálogo en Staxly documenta 0 características y 11 interfazes para desarrolladores.

OpenAI API pertenece a la categoría ai-api — Frontier models: GPT-5, o-series reasoning, image, audio, embeddings. Ofrece 4 tiers de precio: Free Tier (Trial) gratuito, Pay-as-you-go gratuito, Usage Tiers (1-5) gratuito, Enterprise (personalizado). Su catálogo documenta 12 características y 7 interfazes para desarrolladores.

A continuación encontrarás los tiers de precio completos de ambas plataformas, una matriz de cuotas del tier gratuito (transferencia, almacenamiento, MAU, llamadas a la API y otros límites), el listado completo de características y los interfaces (CLI, SDKs, REST, GraphQL, MCP) disponibles para integrar cada servicio.

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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
Anthropic website ↗

OpenAI API

Free Tier (Trial)
$5 free credit for new accounts. Rate-limited.
Free
Pay-as-you-go
No monthly min. Per-token pricing by model.
$0 base (usage-based)
Usage Tiers (1-5)
Automatic tier promotion based on cumulative spend. Higher tiers = higher rate limits + new model access.
$0 base (usage-based)
Enterprise
Custom. Priority access, SLA, dedicated capacity.
Custom
OpenAI Platform ↗

Free-tier quotas head-to-head

Comparing opus-4-7 on Anthropic API vs free-tier on OpenAI API.

MetricAnthropic APIOpenAI API
discount batch50 % off—

Features

Anthropic API · 0 features

    OpenAI API · 12 features

    • Assistants API — Stateful assistants with tools, threads, file search.
    • Batch API — 50% discount for async processing within 24h.
    • Chat Completions API — Classic /v1/chat/completions endpoint.
    • Files API — Upload docs for retrieval, fine-tuning, batch.
    • Fine-Tuning — Supervised + DPO fine-tuning for GPT-4o, GPT-4.1, GPT-4o-mini.
    • Function Calling — JSON-schema tool calling; parallel calls supported.
    • Moderation — Safety classifier API (free).
    • Prompt Caching — Auto-cache repeated prefixes; 50% cheaper cached hits.
    • Realtime API — WebSocket streaming voice + text with low latency.
    • Responses API — Stateful conversational API.
    • Structured Outputs — Enforced JSON schema compliance.
    • Vision — Image input for GPT models.

    Developer interfaces

    KindAnthropic APIOpenAI API
    CLIClaude Code CLI—
    SDKGo SDK, Java SDK, Python SDK, Ruby SDK, TypeScript SDK (@anthropic-ai/sdk)openai-dotnet, openai-go, openai-node, openai-python
    RESTAWS Bedrock, Google Vertex AI, Microsoft Azure AI, REST API (Messages + Agents)OpenAI REST API
    MCP—OpenAI MCP
    OTHER—Realtime API (WebSocket)

    Key takeaways

    • Both Anthropic API and OpenAI API offer a free tier — Anthropic API ("Opus 4.7 — usage") and OpenAI API ("Free Tier (Trial)") — with no credit card required to start.
    • OpenAI API has a broader documented feature set (12 features) vs. Anthropic API (0 features) in Staxly's catalog.
    • Developer integrations differ: only Anthropic API offers CLI/UI; only OpenAI API offers MCP/OTHER.
    Staxly is an independent catalog of developer platforms. Some links to Anthropic API and OpenAI API may be affiliate links — Staxly may earn a commission if you sign up through them, at no extra cost to you. Pricing is verified against vendor pages at publication time — reconfirm before buying.

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