Codex

OpenAI’s coding agent, on a separate bf16 profile.

Base URL

https://api.bf16.ai/v1

Protocol

openai-responses

Who this is for
Codex users who want a second profile rather than a swap.

Set up

Commands show $BF16_API_KEY. Sign in to fill in your own key automatically.

1
Export your key
The profile reads BF16_API_KEY from your shell environment.
```
export BF16_API_KEY=sk-bf16-v1-...
```

Write the profile

~/.codex/bf16.config.toml

# ~/.codex/bf16.config.toml  (Codex 0.134+ profile file)
model = "deepseek/deepseek-v4.1-flash-uncensored"
model_provider = "bf16"
model_context_window = 1048576
model_auto_compact_token_limit = 900000

[model_providers.bf16]
name = "bf16.ai"
base_url = "https://api.bf16.ai/v1"
wire_api = "responses"
env_key = "BF16_API_KEY"

Start Codex on it

Your default `codex` profile stays exactly as it was.

mkdir -p ~/.codex
cat > ~/.codex/bf16.config.toml <<'EOF'
model = "deepseek/deepseek-v4.1-flash-uncensored"
model_provider = "bf16"
model_context_window = 1048576
model_auto_compact_token_limit = 900000
[model_providers.bf16]
name = "bf16.ai"
base_url = "https://api.bf16.ai/v1"
wire_api = "responses"
env_key = "BF16_API_KEY"
EOF
codex --profile bf16

How to know it worked

Codex reports the bf16 provider at startup.
The request shows up in your console logs.
curl https://api.bf16.ai/v1/models -H "Authorization: Bearer $BF16_API_KEY"

Common errors

Symptom

Codex ignores the profile.

Cause

It was started without --profile bf16.

Fix

Pass --profile bf16, or copy those fields into ~/.codex/config.toml.

Symptom

400 on an unsupported wire format.

Cause

wire_api is missing or set to chat.

Fix

Use wire_api = "responses", as the profile above does.

Do not have it yet?

npm install -g @openai/codex

Official docs