Codex is OpenAI's open-source coding agent for the terminal. It works from natural-language instructions to edit code across your project, run commands, and complete tasks end to end, with its source available on GitHub under Apache-2.0. On Opper, launch it on GPT, Claude, Gemini, DeepSeek and 700+ more — one key, automatic fallbacks, and a choice of region.
CodexoninPaste this into your coding agent (Claude Code, Cursor, Codex, and more) and it will set up and build with Opper for you.
GLM-5.3-Flash runs on the routes below. Route only to EU providers when your data has to stay in Europe.
| Provider | Region | Zero data retention | Training | Input | Output |
|---|---|---|---|---|---|
| Berget | EU | No | $0.29 | $0.57 | |
| GreenPT | EU | No | $0.13 | $0.50 | |
| Inceptron | EU | No | $0.15 | $0.50 | |
| Nextbit | EU | No | $0.15 | $0.50 | |
| Sference | EU | No | $0.20 | $0.60 | |
| TensorX | EU | No | $0.20 | $0.50 | |
| DeepInfra | US | No | $0.15 | $0.50 | |
| DigitalOcean | US | No | $0.15 | $0.50 | |
| Morph | US | No | $0.10 | $0.35 | |
| Novita | US | No | $0.15 | $0.50 | |
| Perplexity | US | No | $0.15 | $0.50 | |
| Wafer | US | No | $0.10 | $0.35 | |
| Modal | Multi | No (opt-in) | $0.45 | $1.50 | |
| Nebius | Multi | No | $0.15 | $0.50 | |
| Z.ai | Multi | No | $0.15 | $0.50 |
GLM-5.3-Flash by Z.ai is a natively multimodal 320B MoE with 18B active parameters, hybrid sparse and linear attention, a 1M-token context, and MIT open weights for coding and agent work.
Anthropic's terminal coding agent. Run it on any model on Opper, not just Claude.
opper launch claude
DeepSeek's open-source coding agent. Add Opper as a custom provider to run it on any model, not just DeepSeek's.
OpenAI-compatible
GitHub's terminal coding agent. Point its provider variables at Opper to run it on any model, no Copilot plan required.
OpenAI-compatible