Compare
Claude Opus 4 5 vs GPT-4o Search Preview
This page is context-first: how much text each model can take in one request. Full specs adds capabilities and limits; the pricing matrix below is only about $/million tokens from hosts that list both models.
Model
Claude Opus 4 5
Context window
200K
200,000 tokens · ~150K words
Model
GPT-4o Search Preview
Context window
128K
128,000 tokens · ~96K words
Context window · side by side
Bar length is relative to the larger of the two windows (100% = max of this pair). This is not pricing.
Claude Opus 4 5 has about 1.6× the context window of the other in this pair.
Claude Opus 4 5 has 56% more context capacity (200K vs 128K tokens). GPT-4o Search Preview is 50% cheaper on input.
Quick verdicts
Short takeaways — validate with your own workloads.
Long document processing
Use Claude Opus 4 5. Its 200K context fits entire documents without chunking (vs 128K).
RAG / high-volume retrieval
Use GPT-4o Search Preview. Input tokens are 50% cheaper — critical when sending large retrieved contexts.
Long output (reports, code files)
Use Claude Opus 4 5. Its 64K max output lets you generate complete artifacts in one request.
Full specs
Context, output, capabilities, and dates. Green highlights the favorable value where we compute a winner.
| Spec | Claude Opus 4 5 | GPT-4o Search Preview |
|---|---|---|
| Context window | 200,000 tokens (200K) | 128,000 tokens (128K) |
| Max output tokens | 64,000 tokens (64K) | 16,384 tokens (16K) |
| Speed tier | Deep | Balanced |
| Vision | Yes | Yes |
| Function calling | Yes | Yes |
| Extended thinking | Yes | No |
| Prompt caching | Yes | Yes |
| Batch API | Yes | Yes |
| Release date | N/A | Mar 2025 |
Pricing matrix
Dollar rates only: hosts that list both models, per 1M tokens. For how much text fits, use the context section above — not this table.
| Provider | Claude Opus 4 5 in | Claude Opus 4 5 out | GPT-4o Search Preview in | GPT-4o Search Preview out |
|---|---|---|---|---|
| Anthropic | $5.00/M | $25.00/M | — | — |
| Azure | $5.00/M | $25.00/M | — | — |
| Gmi | $5.00/M | $25.00/M | — | — |
| Google Vertex | $5.00/M | $25.00/M | — | — |
| Openai | — | — | $2.50/M | $10.00/M |
| Openrouter | $5.00/M | $25.00/M | — | — |
Frequently asked questions
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Example: a multi-turn chat session
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