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Claude Code API

What Claude Code costs a month on AIGROW credit

A developer working in Claude Code sends about 250 requests on a working day. Over 21 working days on Claude Opus 5.5, that comes to $138.60 through AIGROW credit and $252 at Anthropic’s list price. The saving is 45%, smaller than the 60% on input and output, and this page shows why.

List prices checked 12 November 2026. The AIGROW rates are read from the same file the endpoint bills with.

The month, model by model

A month of Claude Code through AIGROW credit and at list
ModelThrough AIGROW creditAt listSaving
Claude Opus 5.5$138.60$25245%
Claude Fable 5.2$214.20$44151%
Claude Fable 5.1$267.75$551.2551%
Claude Sonnet 5.5$61.43$12651%

Counted for 250 requests a working day over 21 working days. Each request reads 60,000 tokens from the prompt cache, writes 2,400 to it, sends 1,200 uncached and gets 600 back. Different volume? Try your own numbers on the API page.

Why the saving is 45% and not 60%

Claude Code resends the conversation and your files with every request, and almost all of it comes from the prompt cache. In this month, 315 million of the 337 million tokens are cache reads. On Opus 5.5, AIGROW bills cache reads at the list price, $0.20 per million, so that part costs the same as at Anthropic: $63 in both columns. The saving comes from cache writes, uncached input and output, which cost 60% less. Cache writes on Claude models go to the 1-hour cache, so both columns price them as 1-hour writes.

A discount quoted on input and output alone leaves this out. If your sessions are short or start from a cold cache, your saving moves toward 60%. If they are long, it moves toward the figure above.

Opus 5.5 or Sonnet 5.5 for Claude Code

  • Opus 5.5 through credit: $138.60 a month, more than Sonnet 5.5 at list ($126).
  • Sonnet 5.5 through credit: $61.43 a month, 51% below its list price.
  • Through credit, Sonnet 5.5 stays the cheaper of the two, by $77.17 a month.

Set it up

Four variables in your shell, or the same keys under env in ~/.claude/settings.json.

Claude Code

The last variable matters: Claude Code sends small background calls to a Haiku model, and this endpoint does not serve one, so point them at Sonnet 5.5.

export ANTHROPIC_BASE_URL="https://aigrow.gg"
export ANTHROPIC_AUTH_TOKEN="ag_your_key_here"
export ANTHROPIC_MODEL="claude-opus-5.5"
export ANTHROPIC_DEFAULT_HAIKU_MODEL="claude-sonnet-5.5"

claude

Open the Claude Code setup guide for settings.json and the usual errors.

Which pack covers a month

The Opus 5.5 month above uses $554.40 of credit, four times its $138.60 price, because credit sells at a quarter of its face value. The $250 pack ($1,000 of credit) covers it with room to spare, and the $125 monthly plan adds $600 of credit each month. A Sonnet 5.5 month uses $245.70 of credit, which the $125 pack covers.

Claude Code API questions

At about 250 requests a working day on Claude Opus 5.5, about $252 a month at Anthropic’s list price and about $139 through AIGROW credit. Your own figure scales with how many requests you send and how long your sessions are.

Claude Code reads most of each request from the prompt cache, and on Opus 5.5 cache reads cost the list price through credit too. Cache writes, uncached input and output cost 60% less, so a typical month saves 45%.

Set ANTHROPIC_BASE_URL to https://aigrow.gg and ANTHROPIC_AUTH_TOKEN to your ag_ key, choose a model with ANTHROPIC_MODEL, and set ANTHROPIC_DEFAULT_HAIKU_MODEL to claude-sonnet-5.5.

Through credit, a typical month costs about $139 on Opus 5.5 and about $61 on Sonnet 5.5, so Sonnet 5.5 stays the cheaper of the two. If you pay Anthropic’s list price for Sonnet 5.5 today, about $126 for the same month, moving the same model to credit saves 51%.

No. A 429 (slow down), a 502 or 503 (temporary error) and a request for a model the endpoint does not serve are not billed. Claude Code retries a 429 or a temporary error on its own.

Requests return a 402 until you redeem another code. Nothing else in your setup needs to change.

A month of Claude Code on Opus 5.5 for $138.60.

Start with the $25 pack, run your real sessions against it, and check the dashboard before buying more.

Buy API creditOpen the Claude Code setup guide

Monthly plans or one-off packs · redemption code delivered at once · usage dashboard included