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OpenAI vs Anthropic Claude — API Comparison

Head-to-head comparison of pricing, features, and use case fit. Updated November 5, 2026.

⚡ Verdict: OpenAI wins on ecosystem breadth; Anthropic wins on writing and long context.

💰 Pricing Comparison

Metric OpenAI Anthropic Claude
Input Price GPT-6 Astra: $10/M input + $50/M output (1.05M context, cache $1/$12.50, Fast 2x, Batch 50%); GPT-6.1 Sol: $2/M input + $10/M output Standard (1.05M context); GPT-6.1 Terra: $1/M input + $5/M output Standard, $0.50/$2.50 Batch (1.05M context, >272K input = 2x input / 1.5x output); GPT-5.6 Sol: $4/$20 Standard, $2/$10 Batch (promo through Nov 21, 2026); GPT-5: $1.25/$10, GPT-5 mini: $0.25/$2, GPT-4o: $2.50/$10, GPT-4o mini: $0.15/$0.60 Fable 5.1/Mythos 5.1: $10/M (cache read $0.25/M), Opus 5.5: $4/M (cache read $0.20/M), Opus 5/4.8: $5/M, Sonnet 5.5: $2/M, Haiku 5.5: from $0.10/M, Sonnet 5/4.5: $3/M, Haiku 4.5: $0.80/M
Output Price Batch/Flex API for all models: 50% discount; long-context (>272K input): 2x Standard tier; Fast mode: 2x applicable rates; cache writes 1.25x input Fable 5.1/Mythos 5.1: $50/M, Opus 5.5: $20/M, Opus 5/4.8: $25/M, Sonnet 5.5: $10/M, Haiku 5.5: from $0.50/M, Sonnet 5/4.5: $15/M, Haiku 4.5: $4/M
China Access ❌ Proxy required (export control restrictions for China users) ❌ Proxy required (US export controls)
Free Tier New accounts receive $5 in credits valid for 3 months Limited Claude.ai free tier (web only); no API credits; Sonnet 5 limited-time pricing at $2/M until Aug 31, 2026
Models 14+ 12+
Overall Rank #1 #2

🤖 Supported Models

OpenAI

GPT-6 Astra (frontier, $10/$50 Standard, $1/$12.50 cache, 1.05M context, ExploitBench 100%, Critical cybersecurity)GPT-6.1 Terra (fast, $1/$5 Standard, $0.50/$2.50 Batch, 1.05M context, computer use)GPT-6.1 Sol (frontier, $2/$10 Standard, $1/$5 Batch, 1.05M context)GPT-5.6-Sol (frontier, $4/$20 Standard, $2/$10 Batch)GPT-5.6-Terra (mid-tier, $2/$12 Standard, $1/$6 Batch)GPT-5.6-Luna (efficient, $0.20/$1.20 Standard, $0.10/$0.60 Batch)GPT-5GPT-5-mini +6 more

Anthropic Claude

Claude Fable 5.1Claude Mythos 5.1Claude Sonnet 5.5Claude Sonnet 5Claude Opus 5.5Claude Opus 5Claude Opus 4.8Claude Sonnet 4.5 +4 more

✨ Pros

OpenAI

  • ✓ Reference implementation of the OpenAI Chat Completions API; every 'OpenAI-compatible' third-party provider targets parity with this surface.
  • ✓ GPT-5.6 Sol cut to $4/$20 Standard on August 22, 2026 — promotional through at least November 21, 2026; Batch tier effectively $2/$10.
  • ✓ GPT-5.6 family has three SKUs (Sol frontier $4/$20, Terra mid $2/$12, Luna efficient $0.20/$1.20) for capability-tiered workloads.
  • ✓ First-party support for function calling, structured outputs (JSON schema), streaming (SSE), Realtime voice, vision (images + PDFs), and async Batch API at 50% off.
  • ✓ Chat Completions / Responses / Assistants / Realtime / Images / Audio / Embeddings — seven distinct API surfaces for different workloads.
  • ✓ Enterprise tier ships SOC 2 Type II + ISO 27001 + HIPAA eligibility + Zero Data Retention + EU data residency + admin SSO + audit log API.
  • ✓ $5 in free credits for new accounts, valid for 3 months; org-wide rate limits visible in dashboard; per-key usage telemetry on every model.

Anthropic Claude

  • ✓ Claude Opus 5 launched Jul 24, 2026: Opus 4.8 price ($5/$25) with near-Fable 5 performance
  • ✓ Claude Sonnet 5 launched: limited-time $2/M input pricing until Aug 31, 2026
  • ✓ Top-tier coding capabilities, preferred for Agent applications
  • ✓ Claude Opus 4.8 long context (200K), strongest in the Opus family
  • ✓ Sonnet 5 narrows gap to Opus 4.8 on agentic search/computer use benchmarks
  • ✓ Artifacts feature supports code previews and interactive output

⚠️ Cons

OpenAI

  • × Higher API costs (o1 series $15-60/M)
  • × China requires proxy for access
  • × Frequent output model updates, occasional API compatibility issues
  • × High token consumption, especially o1 series
  • × No special discounts beyond batch credits

Anthropic Claude

  • × API pricing still on the high end (Opus 4.8: $5 in / $25 out)
  • × China requires proxy (US export controls)
  • × Limited-time pricing window is short (Sonnet 5 only 8 weeks)
  • × Strict rate limits, especially on the free tier

🎯 Best For

OpenAI

Production workloads requiring industry benchmark quality; Function Calling/Structured Output; multimodal applications

Anthropic Claude

Code generation and debugging; Agent/Copilot applications; Sonnet 5 limited-time pricing fits long-context + high-token workloads

❓ FAQ

Which is cheaper, OpenAI or Anthropic Claude? ▼

OpenAI — Input: GPT-6 Astra: $10/M input + $50/M output (1.05M context, cache $1/$12.50, Fast 2x, Batch 50%); GPT-6.1 Sol: $2/M input + $10/M output Standard (1.05M context); GPT-6.1 Terra: $1/M input + $5/M output Standard, $0.50/$2.50 Batch (1.05M context, >272K input = 2x input / 1.5x output); GPT-5.6 Sol: $4/$20 Standard, $2/$10 Batch (promo through Nov 21, 2026); GPT-5: $1.25/$10, GPT-5 mini: $0.25/$2, GPT-4o: $2.50/$10, GPT-4o mini: $0.15/$0.60, Output: Batch/Flex API for all models: 50% discount; long-context (>272K input): 2x Standard tier; Fast mode: 2x applicable rates; cache writes 1.25x input. Anthropic Claude — Input: Fable 5.1/Mythos 5.1: $10/M (cache read $0.25/M), Opus 5.5: $4/M (cache read $0.20/M), Opus 5/4.8: $5/M, Sonnet 5.5: $2/M, Haiku 5.5: from $0.10/M, Sonnet 5/4.5: $3/M, Haiku 4.5: $0.80/M, Output: Fable 5.1/Mythos 5.1: $50/M, Opus 5.5: $20/M, Opus 5/4.8: $25/M, Sonnet 5.5: $10/M, Haiku 5.5: from $0.50/M, Sonnet 5/4.5: $15/M, Haiku 4.5: $4/M.

Which is better for China access? ▼

OpenAI: ❌ Proxy required (export control restrictions for China users). Anthropic Claude: ❌ Proxy required (US export controls).

What is the overall verdict? ▼

OpenAI wins on ecosystem breadth; Anthropic wins on writing and long context.

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