can I use cli proxy in order to use gpt 6 astra inside claude code using the subscription?

**Yes.** That’s a real, widely used setup: a local Anthropic-compatible proxy sits between Claude Code and OpenAI’s Codex/ChatGPT backend so Claude Code keeps its UI, tools, subagents, and workflow while inference comes from **GPT-6 Astra on your ChatGPT/Codex subscription**, not Anthropic’s API and not pay-per-token OpenAI credits. [Firecrawl](https://www.firecrawl.dev/blog/use-other-models-in-claude-code)

## How it works

Claude Code talks Anthropic’s Messages API (/v1/messages). You point it at localhost instead of api.anthropic.com:

- ANTHROPIC_BASE_URL → the local proxy
- ANTHROPIC_AUTH_TOKEN → a dummy/local token
- ANTHROPIC_MODEL / ANTHROPIC_DEFAULT_OPUS_MODEL etc. → gpt-6-astra

The proxy logs in with **ChatGPT Plus/Pro (Codex OAuth)**, translates each request to Codex’s Responses API, and streams the reply back as Anthropic SSE. Claude Code cannot tell the backend changed. [GitHub](https://github.com/raine/claude-code-proxy)

That is subscription usage (Codex quota), not the OpenAI API meter.

## Does GPT-6 Astra work yet?

Astra shipped around Sept 3, 2026. Proxy support landed quickly:

| Tool | Astra status |
| --- | --- |
| **raine/claude-code-proxy** | Explicit support from v0.1.36 (gpt-6-astra and gpt-6-astra-fast). Confirmed working through a ChatGPT-authenticated Codex account. [Claude-code-proxy.raine](https://claude-code-proxy.raine.dev/reference/changelog/) |
| **CLIProxyAPI** (router-for-me) | Model catalog added immediately, but early builds cloaked as an old Codex client (codex-tui/0.146.0) and OpenAI rejected Astra (not supported when using Codex with a ChatGPT account). Use a **current** build that includes the 0.153.x client identity fix. [GitHub](https://github.com/router-for-me/CLIProxyAPI/issues/5521) |

claude-code-proxy is the cleaner “just run Claude Code on Codex models” option right now. CLIProxyAPI is the bigger multi-provider gateway.

Example launch pattern with claude-code-proxy:

```bash
claude-code-proxy codex auth login
claude-code-proxy serve
```

```bash
ANTHROPIC_BASE_URL=http://127.0.0.1:18765 \
ANTHROPIC_AUTH_TOKEN=unused \
ANTHROPIC_MODEL=gpt-6-astra \
ANTHROPIC_SMALL_FAST_MODEL=gpt-5.6-luna \
claude
```

You can also map tiers, e.g. Opus → Astra, Haiku → a cheaper Codex model.

## What actually works vs what breaks

Usually fine:

- chat, tools, streaming, /model, plan/agent loops
- reasoning effort mapping (low / medium / high / xhigh / max; Astra also has an ultra level some proxies are still catching up on)
- using Claude Code as the harness while Astra does the thinking

Watch for:

- **Quota is ChatGPT/Codex quota**, not Claude Max. Heavy agent sessions burn it fast.
- **Context window mismatch.** Astra is advertised with a very large window, but Codex through these proxies often reports ~272k usable. Set CLAUDE_CODE_AUTO_COMPACT_WINDOW accordingly or Claude Code will compact too early/late. [GitHub](https://github.com/raine/claude-code-proxy/pull/129)
- **Feature gaps.** Some Claude-only tools, prompt-cache economics, and computer-use paths will not map 1:1.
- **Client fingerprint.** Older CLIProxyAPI builds fail Astra even if your ChatGPT plan has it.

## Terms / account risk

This is unofficial.

- Using a **ChatGPT subscription via an unofficial Codex proxy** is against the spirit (and often the letter) of OpenAI’s consumer terms. It can get rate-limited or the account flagged.
- Do **not** feed a **Claude consumer OAuth token** into a third-party proxy. Anthropic has blocked those tokens outside official Claude surfaces since early 2026. For this setup you want ChatGPT/Codex login on the proxy, and a dummy token on the Claude Code side. [Vallettasoftware](https://vallettasoftware.com/blog/post/run-gpt-5-6-in-claude-code)

There is also a more “official-ish” path some writeups mention: OpenAI’s Codex plugin for Claude Code. If you care about ToS, start there before a community proxy.

**Short answer:** yes — use a current Claude↔Codex proxy (claude-code-proxy is the most Astra-ready), log in with ChatGPT/Codex OAuth, point Claude Code at localhost, set the model to gpt-6-astra. It works in practice; treat it as unsupported and quota/ToS-sensitive.

### How to work with GPT-6 Astra in terminal

Use **Codex CLI**. That is the Claude Code equivalent: a terminal agent, with Astra as the model.

1. **Install**
   - macOS / Linux:
   ```bash
   curl -fsSL https://chatgpt.com/codex/install.sh | sh
   ```
or
   ```bash
   npm install -g @openai/codex
   ```
   ```bash
   codex --version
   ```
   You want **0.153.1+**. Astra became selectable around 0.153.1 and the bundled default around 0.153.4. [Blakecrosley](https://blakecrosley.com/guides/codex)

2. **Sign in (subscription)**
   ```bash
   cd /path/to/your/repo
   codex
   ```
   Choose **Sign in with ChatGPT** (Plus / Pro / Business / Enterprise). That uses Codex quota on the plan, not API credits.

3. **Run Astra**
   ```bash
   codex -m gpt-6-astra
   ```
or start codex, then:
   ```bash
   /model
   ```
   and pick gpt-6-astra.

4. **Daily loop (maps to Claude Code)**

| Claude Code | Codex CLI |
| --- | --- |
| claude | codex |
| /model fable | /model → gpt-6-astra |
| CLAUDE.md | AGENTS.md |
| plan mode | /plan |
| permissions | /permissions |
| status | /status |
| background / subagents | /agent |

Example session:
   ```bash
   cd ~/projects/app
   codex -m gpt-6-astra
   ```
   Then:
   ```bash
   Find why checkout fails on empty carts and fix it. Run the tests.
   ```
   Codex reads the repo, edits files, runs commands in its sandbox, and asks when it needs extra permission.

5. **Practical takeaway**
   Claude decides and writes. Codex checks, argues, and takes the jobs Claude is bad at or too expensive for. Max 20x = conductor + implementer. OpenAI 5x = reviewer, adversary, rescuer, mill.