Claude Opus 4.8 vs GPT-5 — Premium vs Premium Pricing 2026

Requests per Day

Days per Month

Anthropic

Claude Opus 4.8

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

OpenAI

GPT-5

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

Which Model for Which Use Case?

Cost Optimization

GPT-5 at $1.25/M input is 75% cheaper than Opus 4.8. For high-volume workloads within 272K context, GPT-5 delivers massive savings.

Best value: GPT-5 (60-75% cheaper)

Long Context

Opus 4.8's 1M context window is 3.7x larger than GPT-5's 272K. For processing long documents, legal files, or codebases, Opus 4.8 is the clear winner.

Long docs: Opus 4.8 | Short context: GPT-5

Complex Reasoning

Opus 4.8 is Anthropic's most powerful model with top-tier reasoning. GPT-5 offers strong performance at a fraction of the cost for most tasks.

Hardest tasks: Opus 4.8 | Most tasks: GPT-5

Enterprise Workloads

Opus 4.8 offers Anthropic's strongest capabilities with 1M context for enterprise document processing. GPT-5 provides OpenAI's ecosystem with dramatically lower costs.

Premium reasoning: Opus 4.8 | Cost-sensitive: GPT-5

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Frequently Asked Questions

Is GPT-5 cheaper than Claude Opus 4.8?

Yes. GPT-5 costs $1.25/M input and $10.00/M output. Claude Opus 4.8 costs $5.00/M input and $25.00/M output. GPT-5 is 75% cheaper on input and 60% cheaper on output. For 1M input + 500K output/month, GPT-5 costs $6.25 vs Opus's $17.50 — saving $11.25/month (64%).

Which has a larger context window?

Claude Opus 4.8 has a 1M token context window — 3.7x larger than GPT-5's 272K context. If you need to process long documents or maintain extensive conversation history, Opus 4.8 has a significant advantage.

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

Choose Opus 4.8 when: (1) you need long context (1M vs 272K), (2) you want Anthropic's strongest reasoning model, (3) your workload involves complex analysis or large document processing. Choose GPT-5 when: (1) cost matters (60-75% cheaper), (2) your context fits within 272K, (3) you want OpenAI's ecosystem.

Are both models production-ready?

Both are production-ready. Opus 4.8 is Anthropic's most powerful model with 1M context and top-tier reasoning. GPT-5 is OpenAI's premium model offering excellent value at lower price points. Both handle enterprise workloads well.