Can I use both GPT-5.5 and Claude Opus 4.7 through one API?

Yes. ApexApi serves both behind one OpenAI-compatible endpoint and a single ak- key. Switch between them by changing the model slug, so you can A/B them on your own prompts without re-integrating.

Which is cheaper, GPT-5.5 or Claude Opus 4.7?

Live per-token prices for both are in the table above. Pricing changes over time, so the table reflects the current catalog rather than a fixed number.

How do I switch from GPT-5.5 to Claude Opus 4.7?

Change one string, the model slug, in your request. Same endpoint, same key, same billing. No new account or SDK.

GPT-5.5 vs Claude Opus 4.7

The short answer

Both are frontier models you can call through one key on ApexApi. GPT-5.5 is the broad multimodal generalist with strong tool orchestration, so it is a safe default for mixed workloads and agents. Claude Opus 4.7 leans into careful long-form reasoning and agentic coding over large contexts. If your work is heavy on multi-file code and deliberate analysis, try Opus first. For general assistants and tool-using agents, start with GPT-5.5. The honest answer is to A/B them on your own prompts, which one key makes easy.

At a glance

	GPT-5.5	Claude Opus 4.7
Maker	OpenAI	Anthropic on Vertex (Claude)
Type	chat	chat
Context window	1,050,000 tokens	1,000,000 tokens
Vision input	Yes	Yes
Tool calling	Yes	Yes
Input price	$6.00 /1M	$6.00 /1M
Output price	$36.00 /1M	$30.00 /1M

Prices are live from the catalog and include our service fee.

When to choose GPT-5.5

•You want one broad generalist for mixed text, vision, and tool-use tasks.
•Your app leans on function calling and structured outputs.
•You prefer OpenAI-style behavior and prompting.

GPT-5.5 API details →

When to choose Claude Opus 4.7

•You do heavy multi-file coding or whole-repo reasoning.
•Careful, long-form analysis matters more than raw speed.
•You want long autonomous agentic runs that hold the thread.

Claude Opus 4.7 API details →

Call both through one API and key

ApexApi serves GPT-5.5 and Claude Opus 4.7 behind a single OpenAI-compatible endpoint. A/B them by changing one string.

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Frequently asked questions

Can I use both GPT-5.5 and Claude Opus 4.7 through one API?: Yes. ApexApi serves both behind one OpenAI-compatible endpoint and a single ak- key. Switch between them by changing the model slug, so you can A/B them on your own prompts without re-integrating.
Which is cheaper, GPT-5.5 or Claude Opus 4.7?: Live per-token prices for both are in the table above. Pricing changes over time, so the table reflects the current catalog rather than a fixed number.
How do I switch from GPT-5.5 to Claude Opus 4.7?: Change one string, the model slug, in your request. Same endpoint, same key, same billing. No new account or SDK.