Claude Code and Codex

Both tools let you change the API endpoint. Pointing them at RevidAPI works immediately — billed in VND, no vendor account required.

Fastest path

Open these URLs in a browser, replacing sk_... with your key:

https://revidapi.com/v1/setup-claudecode?key=sk_YOUR_KEY
https://revidapi.com/v1/setup-codex?key=sk_YOUR_KEY

They return ready-made setup commands for your platform.

Claude Code — manual

export ANTHROPIC_BASE_URL="https://revidapi.com"
export ANTHROPIC_AUTH_TOKEN="sk_YOUR_KEY"
claude

Add those lines to ~/.zshrc or ~/.bashrc to make it permanent.

Pick a model with /model inside Claude Code, or:

export ANTHROPIC_MODEL="claude-sonnet-5"

Codex CLI — manual

Edit ~/.codex/config.toml:

model_provider = "revidapi"
model = "gpt-6-astra"

[model_providers.revidapi]
name = "RevidAPI"
base_url = "https://revidapi.com/v1"
wire_api = "responses"
env_key = "REVIDAPI_KEY"

Then:

export REVIDAPI_KEY="sk_YOUR_KEY"
codex

wire_api = "responses" is required. Routing Codex through Chat Completions drops tool calls, and Codex loses the ability to read files in your project.

Cost

Long sessions carry very large input because the whole context is resent each turn. Two things cut the bill most:

• Use /compact once the conversation is long.
• Pick a model that is merely sufficient. claude-sonnet-5 is about 40% cheaper than claude-opus-5 on both input and output, and handles most code edits.

See Saving with cache.