OpenAI API vs Anthropic Claude
An honest, mathematical pricing and capability comparison for developers and engineering leaders.
OpenAI API
Industry-standard foundation models with automatic prompt caching and vision.
What this comparison covers
Commercial API inference for generative language and reasoning models. Shared multi-tenant API endpoints, standard rate limits, and pay-as-you-go billing without committed use discounts or provisioned throughput. Fine-tuning, batch API discounts, embeddings, and audio generation are excluded.
Evaluating 2 products from 4 published in this category. USD monthly equivalents, before tax. Features and service compatibility need separate evaluation.
- Standard input tokens
- 10,000,000 tokens / month
- Output tokens
- 2,000,000 tokens / month
- Cached prompt tokens
- 5,000,000 tokens / month
OpenAI API
Industry-standard foundation models with automatic prompt caching and vision.
$3.08 / month
GPT-4o mini
Official pricing · Checked 2026-10-06
Cost breakdown and exclusions
- Monthly subscription: $0
- Standard input tokens: $1.50
- Output completion tokens: $1.20
- Cached prompt tokens: $0.38
- Automatic 50% prompt caching discount applies to prompts with 1,024+ identical leading tokens.
- Fine-tuning, Batch API discounts, audio/realtime APIs, and image generation.
Anthropic Claude
Leading coding and analytical models with 90% prompt cache read discounts.
Not modeled
Claude 3.5 Haiku
Official pricing · Checked 2026-10-08
Cost breakdown and exclusions
- Claude 3.5 Haiku retired on February 19, 2026. This model is unavailable on the Claude API.
- Claude 3.5 Sonnet retired on October 28, 2025. This model is unavailable on the Claude API.
- This pricing model is not supported.
Detailed Verdict: When to Choose Which
Based on sourced pricing models, included allowances, and the stated workload requirements.
Evidence for OpenAI API:
- GPT-4o mini: $3.08/month at this workload.
- Automatic 50% prompt caching discount applies to prompts with 1,024+ identical leading tokens.
- Excluded: Fine-tuning, Batch API discounts, audio/realtime APIs, and image generation.
- Pricing observation: 2026-10-06.
Evidence for Anthropic Claude:
- Claude 3.5 Haiku: Estimate unavailable at this workload.
- Claude 3.5 Haiku retired on February 19, 2026. This model is unavailable on the Claude API.
- Claude 3.5 Sonnet retired on October 28, 2025. This model is unavailable on the Claude API.
- Excluded: This pricing model is not supported.
- Pricing observation: 2026-10-08.
Specification & Capability Matrix
Side-by-side comparison of baseline pricing, free allowances, supported developer capabilities, and verification dates.
| Feature / Metric | OpenAI API | Anthropic Claude | Edge |
|---|---|---|---|
| Selected plan | GPT-4o mini | Claude 3.5 Haiku | Tied |
| Monthly cost at stated workload | $3.08/month | Estimate unavailable | Tied |
| Billing commitment | Monthly pricing model | Monthly pricing model | Tied |
| Prompt cachingAutomatic or explicit discounts for cached prompt context. | Documented on selected plan | Documented on selected plan | Tied |
| Multimodal / VisionNative support for processing images and documents in prompts. | Documented on selected plan | Documented on selected plan | Tied |
| Structured JSONGuaranteed valid JSON schema mode or constrained decoding. | Documented on selected plan | Documented on selected plan | Tied |
| Reasoning modelInternal chain-of-thought or reasoning token generation. | Not confirmed on selected plan | Not confirmed on selected plan | Tied |
| Pricing observation date | 2026-10-06 | 2026-10-08 | Tied |
Real-World Workload Scenarios
Compare estimated monthly costs across stated workload profiles before deploying.
RAG Chatbot
Conversational assistant with injected knowledge base context
Autonomous Agent
Multi-step tool calling, iterative planning, and document synthesis
High-Volume Extraction
Structured data extraction and entity tagging across records
Interactive Workload Calculator
Slide to match your projected monthly volume and watch how each pricing model reacts.
OpenAI API vs Anthropic Claude FAQ
Direct answers to key technical, pricing, and migration questions.
Is OpenAI API cheaper than Anthropic Claude?
A price ranking is unavailable because one or both products lack an eligible estimate for this workload.
What does this comparison cover?
Commercial API inference for generative language and reasoning models. Shared multi-tenant API endpoints, standard rate limits, and pay-as-you-go billing without committed use discounts or provisioned throughput. Fine-tuning, batch API discounts, embeddings, and audio generation are excluded. Estimates cover modeled fees at the stated usage. Review selected-plan warnings and exclusions; taxes, migration effort and unmodeled requirements are not a savings promise.
How is pricing freshness handled?
The displayed observation dates belong to the selected plans. Stale, future-dated, quote-only or otherwise ineligible estimates do not receive a price ranking. Consult the linked vendor sources before purchasing.