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Side-by-side reference

GPT-5 vs Claude Opus 4

Side-by-side reference for OpenAI GPT-5 and Anthropic Claude Opus 4. Only fields verified on each model's record are shown; everything else is marked unverified. This page does not declare a winner.

Data freshness: last checked 9 d ago · updated 2026-05-20

At a glance

Attributes

AttributeGPT-5Claude Opus 4
ProviderOpenAIAnthropic
Snapshot dateData not yet verified.2025-05-14src
Context window (tokens)Data not yet verified.200,000src
Max output (tokens)Data not yet verified.32,000src
ModalityData not yet verified.text-in, text-outsrc
LifecycleData not yet verified.deprecated (retires 2026-06-15)src

This table compares verified attributes only; cells with no verified value display the canonical unverified-data label. WebmasterID Models does not declare a winner.

Reference

First-party pricing references

Per-unit rates published by each model's creator on their own first-party API. Rows are source-backed references, not live quotes. Hosted-provider references (Groq, Together) render separately below where available.

Pricing is volatile and may change after retrieval. Treat prices as source-backed references, not live quotes. Prices are shown as source-backed references only. WebmasterID Models does not rank models or billing providers by price.

GPT-5

UnitPrice (USD)
1M input tokensData not yet verified.
1M output tokensData not yet verified.

No verified rates for this model yet — see VERIFICATION.md.

Claude Opus 4

UnitPrice (USD)
1M input tokens$15.00src
1M output tokens$75.00src
1M cache write tokens (5m)$18.75src
1M cache write tokens (1h)$30.00src
1M cache read tokens$1.50src
1M batch input tokens$7.50src
1M batch output tokens$37.50src

Capability

Benchmarks

GPT-5

Data not yet verified.

Claude Opus 4

Data not yet verified.

Where to use

Use cases

  • Long-context document analysis
  • Agentic coding workflows
  • Reasoning and structured output

API surface

API usage differences

Endpoint shape, model parameter position, and request body conventions for each provider. Shown for reference, not as a recommendation.

GPT-5

OpenAI

Endpoint
—
Model parameter
—
Canonical ID
—

See the model page for a full documentation-style example request and the citation it derives from.

Claude Opus 4

Anthropic

Endpoint
POST https://api.anthropic.com/v1/messages
Model parameter
JSON body `model` field
Canonical ID
claude-opus-4-20250514

See the model page for a full documentation-style example request and the citation it derives from.

Caveats

Limitations of this comparison

  • Claude Opus 4 (claude-opus-4-20250514) is deprecated and retires 2026-06-15. New workloads should evaluate the active Claude Opus generation listed on Anthropic's models overview.
  • GPT-5 fields are not yet verified against an official OpenAI primary source, so most attributes are marked unverified.
  • WebmasterID Models does not declare a winner; readers should compare verified facts against their own workload.

Source trail

  • Official docsRetrieved 2026-05-20Fresh
    Anthropic — Models overview

    Anthropic's models overview page (legacy section), including the Claude Opus 4 row.

  • Official pricingRetrieved 2026-05-20Fresh
    Anthropic — Pricing

    Anthropic's pricing reference (model pricing, prompt caching multipliers, batch API pricing).

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