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Use GPT-5.5 with Claude Code

$5/Mtok in

Run OpenAI's flagship inside Claude Code for a second opinion on hard problems — same session, same tools, different reasoning style. Useful as a review pass over changes drafted by another model.

Get a key — free starter creditsGPT-5.5 API details

Facts

At a glance

Model

GPT-5.5

openai/gpt-5.5

Price

$5 / M input · $20 / M output

Context window

256k tokens

Tool

Claude Code

Setup below — under two minutes

Quickstart

Set up GPT-5.5 in Claude Code

  1. 1

    Point Claude Code at CompanyFabric:

    export ANTHROPIC_BASE_URL="https://api.companyfabric.com"
export ANTHROPIC_API_KEY="$COMPANYFABRIC_API_KEY"
  2. 2

    Start a session on this model:

    claude --model openai/gpt-5.5
  3. 3

    Every turn's exact cost lands in your dashboard usage feed — set a per-key budget cap if the agent runs unattended.

Full tool guide: Use any model with Claude Code →

FAQ

Frequently asked questions

Do I need a OpenAI account to use GPT-5.5 in Claude Code?

No — one CompanyFabric key covers GPT-5.5 and every other model in the library. Billing is one prepaid balance with exact per-call metering; BYOK at 0% is available if you already have provider keys.

What does GPT-5.5 cost in Claude Code?

$5 / M input · $20 / M output — the same metered price as any other route to the model. Set a per-key budget cap to bound what the tool can spend.

Can I switch models later without touching Claude Code again?

Yes — the endpoint stays the same; the model is a string. Any catalog id works in the same configuration, including cheaper tiers for bulk work.

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One key. Every model. Exact prices.

Run GPT-5.5 in Claude Code with free starter credits. Free starter credits included — no subscription required.

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