Gemma 4 26B A4B IT can compare records across two signed-in websites when a local agent exposes working browser tools. Give it the same stable ID for both pages, an allowlist of fields, and an instruction to preserve conflicts. Tabbit Browser and Tabbit CLI provide the local handoff. Ask for a source-linked comparison draft and stop for human review before either record changes.
| Field result | Required evidence | Draft label |
|---|---|---|
| Same value | Matching stable ID and visible values | match |
| Different value | Matching ID, different displayed values | conflict |
| Missing value | Page does not show the field | not visible |
| Wrong record | Stable IDs do not match exactly | ID mismatch, then stop |
Key takeaways
The official checkpoint is
google/gemma-4-26B-A4B-it, an instruction-tuned mixture-of-experts model. It is separate from dense 31B and from E2B/E4B variants.A4B is part of the MoE model name; do not infer identical memory or latency across serving runtimes from that label alone.
Google documents structured function calling, but the selected server and client still must parse and execute calls correctly.
Match by exact stable ID. Preserve disagreements as conflicts instead of guessing which page is right.
Keep both pages read-only and save a named comparison draft with both URLs for a person to check.
Match the record ID, not a similar title
Two pages can show the same title for different records. Choose an immutable key such as REL-4821. If either page does not show that exact ID, stop. A familiar name is not sufficient evidence that the records match. Decide the fields first, such as owner, status, and updated date, and confirm both pages are within your access rights.
Google lists google/gemma-4-26B-A4B-it as the MoE instruction-tuned model. Its docs distinguish it from dense 31B and edge-sized E2B/E4B. Google documents function calling for Gemma 4; Hugging Face lists vLLM and SGLang serving paths. These are documented starting points, not a guarantee that every hosted API or client currently supports this checkpoint. Confirm the exact route and test a harmless tool before using real signed-in pages.
Set up the agent and local browser
Verify the exact model name, revision, license, access, and tool support in the provider or local server you will use. Google’s Gemini API guide shows gemma-4-26b-a4b-it and function declarations. That establishes a documented Google API path only; check the current model list in your actual host.
Use the agent client’s documented Tabbit skill discovery. Pi uses /skill:tabbit; some clients have /skills or automatic discovery. Do not assume a universal /tabbit command. Then run the installed Tabbit CLI diagnostic separately. A discoverable skill does not prove launcher connectivity, and neither proves that the two sites are signed in.
Install Tabbit Browser and sign in yourself to each permitted site in the intended environment. Start a named task with its own browser tabs, so the agent can compare while you continue other work. Never send passwords or cookies to the model. A remote client needs a separately supported local handoff. See Tabbit CLI setup, connect a local agent, and first-task checklist.
Compare two pages with one stable ID
Give the agent both exact URLs, one immutable ID, and only the fields you need. Keep each value beside the page it came from. Mark a disagreement conflict; mark a hidden or absent field not visible. Do not normalize or infer values unless your team has an explicit rule for it.
Use the local Tabbit browser through the installed Tabbit CLI.
Task name: GEMMA-REL-4821 two-source comparison
Open [permitted site A URL] and [permitted site B URL]. Find the exact record ID REL-4821 on both pages. Stop if either page does not show REL-4821.
Read only: title, owner, status, updated date.
Save a draft named "REL-4821 comparison - review required" with a table: field, site A value, site A URL, site B value, site B URL, result. Result must be match, conflict, not visible, or ID mismatch. Never infer missing values or choose the source of truth.
Keep both pages read-only. Do not edit, close, submit, export, or change settings. Stop if login or extra permission is required.A conflict is useful output. A reviewer checks the exact ID, field labels, dates, and URLs, then follows the team’s source-of-truth rule. The CLI or MCP and signed-in session guide explain local browser handoff and session reuse.
Review before using the comparison
Confirm the exact ID on both pages, then open each URL and check visible labels and dates. Preserve displayed time zones. If a page hides a field, mark it missing. If the IDs differ, reject the match even when the title looks right.
A Reddit user testing Gemma 4 26B on a personal agent reported that a notify function was emitted as notify:notify or system:notify. Another user described problems getting Gemma 4 variants to work with internal tools. These are personal reports, not a general failure rate, but they make a small parser and template test worthwhile. Read the 26B tool-name report and broader tool-use discussion. If calls are malformed, inspect the chat template, parser, schema, and retry behavior. Retries must not write to either site. See browser profiles and task tabs and local web app checks.
Verdict
Use Gemma 4 26B A4B IT for cross-site comparison only after the actual serving path passes a harmless tool-call check. The reliable workflow depends on exact ID matching, a short field allowlist, source links beside values, and explicit conflict labels. Tabbit Browser with Tabbit CLI gives a local agent access to the intended browser environment; it does not validate model output or decide which system is authoritative.
For setup, see permission boundaries and Codex CLI setup. For session and task-tab behavior, read Tabbit CLI setup and connect a local agent.
The current vLLM Gemma 4 recipe shows this family using the gemma4 parser, --enable-auto-tool-choice, and a Gemma 4 chat template. This is a documented serving path, not proof that your agent client uses it. vLLM documents Gemma 4 parser fallbacks, including non-standard call forms and response-tag variation; test actual output with a harmless function.
vllm serve google/gemma-4-26B-A4B-it \
--host 127.0.0.1 \
--max-model-len 8192 \
--enable-auto-tool-choice \
--tool-call-parser gemma4 \
--reasoning-parser gemma4 \
--chat-template examples/tool_chat_template_gemma4.jinjaThe vLLM model table lists 26B total parameters and 4B active for this MoE checkpoint, with one 80 GB NVIDIA GPU as its BF16 baseline. A4B does not mean 4 GB of memory. The recipe’s tool-call example uses the 31B checkpoint; verify the exact 26B route in the serving version you select.
Review decision points
| Field state | Preserve | Human action |
|---|---|---|
| Same ID, same value | Both URLs and displayed values | Mark match; do not infer source policy |
| Same ID, different value | Both values, dates, and URLs | Mark conflict; ask the data owner |
| Field missing | Visible value and URL from the other page | Mark not visible; do not infer |
| ID mismatch | Both observed IDs | Stop; the pages do not show the same record |
Official model references
Official sources: 26B A4B IT model card, function-calling guide, Gemma on Gemini API, and deployment guide.
FAQ
What does A4B mean in Gemma 4 26B A4B IT?
It is part of the official MoE checkpoint name. Confirm runtime resource needs with the serving stack rather than inferring them from the label.
Can Gemma 4 compare two signed-in pages?
Yes, if the local agent can call supported browser tools and both pages are authorized. Match the same stable ID on each page.
What if the two records disagree?
Preserve both values and URLs and mark the field as a conflict. A human should use the team’s source-of-truth rules.
Does the model’s function calling work in every client?
No. Validate the exact template, parser, schema, and executor in the selected host with a harmless function first.
Can the task update either record?
Keep the comparison read-only. Review the draft before a person decides whether to make a separate change.