CompareStack/Anthropic API (Claude) vs OpenAI API
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Updated March 2026 · Independent Analysis

Anthropic API (Claude)vsOpenAI API

Both Anthropic API (Claude) and OpenAI API offer free plans. Both rated 4.7/5 by users.

A
Anthropic API (Claude)

Anthropic's API providing access to Claude models with industry-leading safety, 200K context windows, and strong reasoning capabilities.

★ 4.7/5Founded 2021500K+ users
Try Anthropic API (Claude) Free →
O
OpenAI API

Developer API platform providing access to GPT-4o, DALL-E 3, Whisper, embeddings, and fine-tuning capabilities.

★ 4.8/5Founded 20202M+ users
Try OpenAI API Free →

⚡ Quick Stats

⭐
Avg Rating
Anthropic API (Claude)4.7/5
OpenAI API4.8/5
🏆 OpenAI API wins
💰
Starting Price
Anthropic API (Claude)Free
OpenAI APIFree
🔧
Features
Anthropic API (Claude)12
OpenAI API12
🏆 Anthropic API (Claude) wins
🎁
Free Plan
Anthropic API (Claude)No
OpenAI APINo

📊 Ratings Breakdown

A

Anthropic API (Claude)

4.7/5 avg
G2 Score4.7/5
Capterra Score4.6/5
Overall Avg4.65/5
O

OpenAI API

4.8/5 avg
G2 Score4.7/5
Capterra Score4.8/5
Overall Avg4.75/5

⚡ Quick Verdict

Independent analysis based on features, pricing, and user ratings

Choose Anthropic API (Claude) if you need:
  • ✓ Claude 3.5 Sonnet/Opus/Haiku
  • ✓ 200K context window
  • ✓ Vision capabilities
  • ✓ Fine-tuning (coming)
  • ✓ Safety features
Try Anthropic API (Claude) Free →
Choose OpenAI API if you need:
  • ✓ GPT-4o access
  • ✓ DALL-E 3
  • ✓ Whisper speech-to-text
  • ✓ Embeddings
  • ✓ Fine-tuning
Try OpenAI API Free →

🔧 Feature Comparison

Anthropic API (Claude) uniquely offers Claude 3.5 Sonnet/Opus/Haiku, 200K context window, Vision capabilities. OpenAI API uniquely offers GPT-4o access, DALL-E 3, Whisper speech-to-text. Both share 5 features including Function calling, Streaming, Batch API.

Feature
Anthropic API (Claude)
OpenAI API
Function calling
✓
✓
Streaming
✓
✓
Batch API
✓
✓
JSON mode
✓
✓
Enterprise tier
✓
✓
Claude 3.5 Sonnet/Opus/Haiku
✓
✗
200K context window
✓
✗
Vision capabilities
✓
✗
Fine-tuning (coming)
✓
✗
Safety features
✓
✗
Constitutional AI
✓
✗
Tool use
✓
✗
GPT-4o access
✗
✓
DALL-E 3
✗
✓
Whisper speech-to-text
✗
✓
Embeddings
✗
✓
Fine-tuning
✗
✓
Assistants API
✗
✓
Vision models
✗
✓
Total Features
12
12

💰 Pricing Comparison

Both Anthropic API (Claude) and OpenAI API offer free plans.

A

Anthropic API (Claude) Plans

Paid plans only

Pay per use
Free
  • • Per-token pricing
  • • All Claude models
  • • API key access
Workspaces
Custom
  • • Team management
  • • Usage controls
  • • Enterprise features
Full Anthropic API (Claude) pricing breakdown →
O

OpenAI API Plans

Paid plans only

Pay per use
Free
  • • Token-based billing
  • • Free trial credit
  • • All models available
Full OpenAI API pricing breakdown →
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❓ Frequently Asked Questions

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