Coding agents in the subscription
Anthropic ships Claude Code inside paid Claude plans, including the $20 Pro tier. OpenAI ships Codex inside ChatGPT plans, with free and Go plans limited and Plus and above expanded.
Both are terminal-first agents that also run in the desktop app and IDE extensions, and both now support long-running tasks with tool use.
Model access differs at the top end. Claude Max exposes Opus 5.5 and Fable 5.1 with priority access; ChatGPT Pro exposes GPT-6 Astra at expanded limits and the $500 tier adds Ultrafast responses. Match the tier to the model you actually need rather than to the headline usage multiplier.