GPT-5 vs Claude Opus 4.8 — Pricing Comparison 2026

Requests per Day

Days per Month

OpenAI

GPT-5

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

Anthropic

Claude Opus 4.8

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

Which Model for Which Use Case?

Complex Reasoning & Analysis

Claude Opus 4.8 excels at multi-step reasoning, nuanced analysis, and tasks requiring deep understanding. GPT-5 handles most reasoning well but at a fraction of the cost.

Quality-first: Claude Opus 4.8 | Cost-sensitive: GPT-5 (64% cheaper)

Long-Document Processing

Claude Opus 4.8's 1M context window can process entire codebases, legal documents, or research papers that GPT-5's 272K cannot fit. Essential for large-scale analysis.

Best choice: Claude Opus 4.8 (3.7x more context)

Code Generation & Debugging

Both handle coding well. GPT-5 is dramatically cheaper for standard coding tasks. Opus 4.8's larger context helps when analyzing entire repositories or complex refactoring.

Standard tasks: GPT-5 (75% cheaper on input) | Large codebases: Opus 4.8

Chatbots & Customer Support

High-volume, shorter conversations where cost per request matters most. GPT-5's lower pricing makes it the clear winner for production chatbots at scale.

Best value: GPT-5 (64% cheaper overall)

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Frequently Asked Questions

Is GPT-5 cheaper than Claude Opus 4.8?

Yes, significantly. GPT-5 costs $1.25/M input and $10/M output. Claude Opus 4.8 costs $5/M input and $25/M output. GPT-5 is 75% cheaper on input and 60% cheaper on output. For a typical workload of 1M input + 500K output tokens/month, GPT-5 costs $6.25 vs Claude Opus 4.8's $17.50 — saving you $11.25/month (64%).

Which has a larger context window?

Claude Opus 4.8 has a 1M token context window, while GPT-5 has 272K. Claude Opus 4.8 offers 3.7x more context capacity, which is critical for processing very long documents, maintaining extended conversations, or handling large codebases in a single request.

When should I choose Claude Opus 4.8 over GPT-5?

Choose Claude Opus 4.8 when you need: (1) 1M+ token context for processing entire codebases or long documents, (2) complex multi-step reasoning where Opus's quality may justify the 4x price premium, (3) nuanced creative writing or analysis tasks. Choose GPT-5 when cost efficiency matters more and your inputs fit within 272K tokens.

Can I switch between GPT-5 and Claude Opus 4.8 easily?

Yes. Both use standard REST APIs. If you're using an abstraction layer like LangChain, LiteLLM, or Vercel AI SDK, switching is a one-line config change. The main differences are in API structure (OpenAI vs Anthropic format) and authentication methods (API key vs Anthropic key).