Comparison
ChatGPT Work vs Chat vs Codex — which OpenAI surface are you buying?
OpenAI's consumer plan page lists GPT-6 models for Plus and Pro, while its Work/Codex guide describes a different Chat availability picture. Keep surfaces and API billing distinct.
Product availability checked on 1 October 2026. OpenAI's consumer pricing page lists GPT-6 models for Plus and Pro, while its Work/Codex model guide says GPT-6.1 Sol, GPT-6 Sol and GPT-6 Luna are not available in Chat. The current first-party pages conflict about the Chat rollout; check the account's actual model picker before buying for a specific model.
OpenAI's ChatGPT surfaces and plan descriptions can differ. The August consumer refresh announced GPT-5.6 defaults; the September GPT-6 launch initially described Work and Codex availability, and the October consumer pricing page now lists GPT-6 models for Plus and Pro. Keep Chat, Work, Codex and API usage distinct, and confirm current access on the relevant account.
This guide is for UK teams deciding whether to buy ChatGPT Chat, ChatGPT Work, OpenAI Codex / coding agents, or raw API — and how those choices relate to Free vs Plus after the Luna/Think refresh. Related reading: ChatGPT Free vs Plus 2026, Sol / Luna / Terra tiers, and the OpenAI Codex harness.
Three products, three jobs
| Surface | Best for | Watch-out |
|---|---|---|
| ChatGPT Chat | Everyday Q&A and drafting | Consumer plan page lists GPT-6 models for Plus/Pro, but another OpenAI guide describes them as unavailable in Chat; verify in account. |
| ChatGPT Work | Team knowledge and workplace workflows | Access and model availability depend on plan, client, settings and rollout. |
| Codex / coding agents | Delegated coding against repos | ChatGPT plans include varying Codex access; check plan allowance and model access. API usage remains separately billed. |
Chat is the consumer conversation product. OpenAI's August 2026 announcement described Free/Go Luna with Think and refreshed Sol with effort controls for paid users; its current consumer plan page lists GPT-6 models for Plus/Pro. These are dated product snapshots, and the current Work/Codex model guide describes a different availability picture. Check the relevant model picker.
Work is the workplace product: shared knowledge, admin, and team workflows. Buy Work when the job is organisational ChatGPT with controls — not when the job is “developers need an agent on the monorepo.” Expect feature and model lag versus consumer Chat after major Chat-only refreshes until OpenAI says otherwise.
Codex and related coding agents are for repository work. ChatGPT plans include varying levels of Codex access, so check the plan's current allowance and model availability. Compare Codex with Cursor, Claude Code, and GitHub Copilot on setup cost, review discipline, and metering. API billing remains separate from ChatGPT plan usage.
Raw API (gpt-6.1-sol, gpt-6-sol, gpt-6-luna, gpt-5.6-terra and older IDs) is a fourth meter entirely. Product features that call the API should budget tokens separately from Chat seats. See the current GPT-6.1 Sol, GPT-6 Sol and GPT-6 Luna profiles.
How teams usually get this wrong
The classic failure mode is a single spreadsheet cell labelled “OpenAI” that mixes:
- Founder Plus subscriptions used for email drafts.
- A Work rollout for customer support macros.
- A quiet Codex or Cursor BYOK spike on Sol.
- A backend feature calling the API on every page view.
When September pricing or weekly limits bite, nobody knows which surface to cut. Split the cell into Chat, Work, Codex/harness, and API before you renew anything.
GPT-6.1 Sol rollout in Work and Codex
OpenAI released GPT-6.1 Sol on 29 September after GPT-6 Sol and Luna launched on 22 September. As of 1 October, the consumer pricing page lists GPT-6.1 Sol, GPT-6 Astra, GPT-6 Sol and GPT-6 Luna for Plus, with expanded access on Pro. The separate model guide lists GPT-6.1 Sol, GPT-6 Sol and GPT-6 Luna as Work/Codex models and says they are not available in Chat. This is a first-party documentation conflict; confirm the exact account's current picker. API prices are separate: gpt-6.1-sol is $2/$10 per million standard tokens with $0.10 cached input; GPT-6 Sol is $2/$10 with $0.20 cached input; GPT-6 Luna is $0.10/$0.50.
For buyers this is a model-availability detail, not a guarantee that every paid account has the rollout. If the job is company knowledge work or delegated coding, check the tenant's actual model picker and plan access before committing. A Plus receipt alone does not establish that a Work or Codex model is available to that account.
Another failure mode: assuming a model listed on a plan page is available in every client or workspace. Read the current product guide and confirm in the tenant's picker; schedule validation for each surface separately.
A practical buying sequence
- Write the job in one sentence: draft emails, answer employees with company knowledge, ship code with an agent, or power a product feature.
- Map the job to Chat, Work, Codex/harness, or API — only one primary surface.
- For Chat, compare Free/Go vs Plus/Pro using the current plan page and model picker because OpenAI's availability pages differ.
- For Work, run a pilot with real knowledge sources and admin policies before company-wide seats.
- For coding, run the AI coding assistant finder and compare setup guides — do not default to Codex because the brand is OpenAI.
- For API, pick model IDs and rate limits explicitly; never “whatever Chat uses.”
When to prefer something else
- Heavy IDE agent work with multi-file refactors: evaluate Cursor or Claude Code beside Codex.
- Strict data residency or BAA paths: check each vendor’s enterprise story; OpenAI Chat alone may not be the answer.
- Pure automation without chat UX: prefer API or an automation platform, not Chat seats.
- A Microsoft 365 shop: on 25 September Microsoft announced a new Copilot app that combines Chat and Cowork, with a Code capability for building small apps. Everyday Copilot use is covered by a per-user licence, while Cowork, Code and frontier models run on usage-based billing. Compare that seat model against ChatGPT Work before buying either.
Common mistakes
- Buying Plus for every employee when Work was the real requirement — or the reverse.
- Expecting Codex behaviour from ChatGPT Chat.
- Assuming an announced Work/Codex rollout means every account has access immediately.
- Treating API spend as included in Chat subscriptions.
- Skipping harness comparison because “we’re already an OpenAI shop.”
Bottom line
Buy the surface that matches the job. Chat, Work, and Codex have separate controls and allowances, and current model availability pages do not fully agree. Keep API billing separate, verify the plan and account picker, and pilot workplace and coding workflows before standardising.
Sources
- OpenAI — ChatGPT Learn model documentation (GPT-6.1 Sol, GPT-6 Sol and GPT-6 Luna are Work/Codex models, not ordinary Chat): https://developers.openai.com/codex/models — checked 2026-10-01
- OpenAI — ChatGPT pricing and plan/model table (plan-level consumer Chat and Codex allowances): https://chatgpt.com/pricing/ — checked 2026-10-01
- OpenAI — GPT-6.1 Sol API model documentation (pricing and model details): https://developers.openai.com/api/docs/models/gpt-6.1-sol — checked 2026-10-01
- OpenAI — Introducing GPT-6 Sol and Luna (22 Sep 2026; first Work/Codex availability): https://openai.com/index/introducing-gpt-6-sol-and-luna/ — accessed 2026-09-26
- Microsoft — Introducing the new Copilot with Home, Code and Autopilot (25 Sep 2026; per-user licence vs usage-based billing): https://blogs.microsoft.com/blog/2026/09/25/introducing-the-new-copilot-with-home-code-and-autopilot/ — accessed 2026-09-26
- OpenAI — GPT-5.6 (Sol $4/$20, Terra $2/$12, Luna $0.20/$1.20; 1.05M context): https://openai.com/index/gpt-5-6/ — accessed 2026-08-29
- OpenAI API pricing: https://platform.openai.com/docs/pricing — accessed 2026-08-29
Editorial note
AI Choice Engine publishes editorial guides to help readers understand fit, trade-offs, and next steps before choosing a tool or provider.
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