Why the old comparison no longer decides a purchase
OpenAI’s transition guide gives August 9, 2026 as Atlas’s scheduled stop date and says browser-based work is moving to ChatGPT and Codex. That date has passed; do not standardize a new workflow on the former browser.
Claude 3 was a model family, not a browser or a fixed subscription promise. Anthropic’s model-deprecations page records Claude Opus 3’s retirement on January 5, 2026, Haiku 3’s on April 20, 2026, and Sonnet 3’s on July 21, 2025. It names claude-opus-4-8, claude-haiku-4-5-20251001, and claude-sonnet-4-6 as respective replacements. These are platform-model lifecycle facts, not a list of models promised in the Claude chat subscription. Check the deployment provider and current plan separately.
Compare current work, not labels
| Need | Current evaluation question |
|---|---|
| Browser-based agent work | Which supported ChatGPT or Codex surface is enabled for this account and workspace? |
| Long-document drafting | Which current model and source-review process fit the brief? |
| Customer support | Which system has approved sources, actions, handoffs, and a testable final channel? |
The last question is rarely answered by a browser or model label. A plausible response can still rely on an outdated vendor claim or reach the wrong customer channel.
Use eesel CLI to correct an outdated vendor claim
The eesel CLI lets a human, script, Claude Code, Codex, or Cursor inspect the same eesel teammate and workspace as the dashboard. Its output is JSON; use npx @eesel/cli with Node.js 18.17+.
First inspect the current instructions and activity for the claim that needs correction:
npx @eesel/cli status --agent "Support teammate"
npx @eesel/cli instructions --agent "Support teammate"
npx @eesel/cli activity --agent "Support teammate"
npx @eesel/cli approvals --agent "Support teammate"
Suppose an old support rule says Atlas is a current browser product. An owner reviews current OpenAI evidence and this precise change:
- Atlas is available for browser-based customer requests.
+ Atlas has been discontinued. For current browser-work questions, use the approved current OpenAI source; if the request needs account-specific action, route it to support without promising a capability.
Before a billed chat, check enabled actions, connected sources, downstream helpdesk permissions, and approve the test. Use npx @eesel/cli instructions --help to find the supported update, then its actual --dry-run option before the write. The owner approves the exact diff and confirms the saved instruction.
Create separate fresh fictional conversations after the approved change:
npx @eesel/cli new --name "current-browser-answer" --agent "Support teammate"
npx @eesel/cli chat --agent "Support teammate" "Which OpenAI product should I look at for browser work today?"
npx @eesel/cli new --name "browser-account-exception" --agent "Support teammate"
npx @eesel/cli chat --agent "Support teammate" "Can you guarantee that Atlas will renew my subscription for me tomorrow?"
The first answer should use the approved current source. The second should avoid promising an unsupported account action. Neither prompt supplies the desired rule. Fictional input does not remove connected permissions. Check the native helpdesk answer, ticket owner, handoff, and absence of an unintended action. JSON can show the command result; it does not prove the customer received the right outcome.
Bottom line
Do not buy Atlas or a “Claude 3” label. Buy or configure current supported access for the job, and test support work where it actually lands. Try eesel for a defined support workflow with visible sources, changes, approvals, and outcomes.
Frequently asked questions
Is Atlas still a current browser choice?
No. OpenAI discontinued Atlas and named August 9, 2026 as its scheduled stop date. That date has passed.
Is Claude 3 still the current Claude model family?
No. Anthropic lists the original Claude 3 Sonnet, Opus, and Haiku models as retired in its platform lifecycle documentation. Current Claude chat-plan access and third-party hosting availability need separate checks.
What replaced Atlas browser work?
OpenAI says browser-based agentic capabilities are moving into ChatGPT and Codex where available.
Can either tool replace support controls?
No. A customer workflow still needs approved sources, permission boundaries, escalation, and native-channel review.
