---
title: "Update A/B test variant"
method: PATCH
path: "/ab-tests/{abTestId}/variants/{variantId}"
tags: ["A/B Tests"]
---

# Update A/B test variant

`PATCH /ab-tests/{abTestId}/variants/{variantId}`

Updates an A/B test variant's subject, preview text, or body content. Campaign variants remain editable only while the test is in draft. Sequence variants can be edited later with confirmLiveChange when the sequence is active, the test is no longer a draft, or the test has recorded activity; earlier sends remain unchanged, so combined results may no longer be accurate.

## Path parameters

- `abTestId` string, required
- `variantId` string, required

## Request body

- object
  - `html` string — Raw HTML body. Provide either html or blocks, not both.
  - `blocks` EmailBlock[] — Structured email blocks. Provide either blocks or html, not both. Put visual styling under styles; top-level style keys such as backgroundColor, backgroundOpacity, borderColor, borderWidth, and borderRadius are normalized into styles.
    - `id` string
    - `type` 'text' | 'html' | 'heading' | 'list' | 'button' | 'spacer' | 'divider' | 'image' | 'columns' | 'conditional-group' | 'repeat' | 'card' | 'cta' | 'social' | 'logo' | 'header' | 'footer' | 'video' | 'product' | 'discount-code' | 'code' | 'countdown' | 'hero' | 'testimonial' | 'gallery' | 'badge' | 'table' | 'features' | 'image-card' | 'pricing' | 'author' | 'article' | 'rating' | 'stats' | 'steps' | 'product-grid' | 'poll', required
    - `content` string — Content for text, html, and heading-like blocks.
    - `styles` object — Per-block visual styles. For compatibility, style fields such as backgroundColor, backgroundOpacity, borderColor, borderWidth, and borderRadius can also be supplied at the block top level and are normalized into this object.
      - `paddingTop` number
      - `paddingBottom` number
      - `paddingLeft` number
      - `paddingRight` number
      - `backgroundColor` string
      - `backgroundOpacity` number — Background opacity percentage from 0 to 100.
      - `textColor` string
      - `textAlign` 'left' | 'center' | 'right'
      - `borderRadius` number
      - `borderColor` string
      - `borderWidth` number
      - `bleed` boolean — Stretch the block edge-to-edge across the email container. Top-level blocks only.
    - `conditions` object[] — Optional per-block display rules. The block renders only when every rule matches. The same shape is used for a conditional-group block's top-level `conditions`.
      - `id` string, required
      - `field` 'variable' | 'attribute' | 'email' | 'firstName' | 'lastName', required — `variable` resolves a merge-tag path from the transactional send `variables` or an automation `event` payload (nested paths like `order.total` or `event.plan` work). `attribute` reads a stored subscriber attribute. `email`, `firstName`, and `lastName` read core subscriber fields.
      - `operator` 'is' | 'is_not' | 'contains' | 'not_contains' | 'gt' | 'gte' | 'lt' | 'lte' | 'is_empty' | 'is_not_empty', required
      - `value` string, required — For `variable` and `attribute`, use `name:value` - the part before the colon is the variable path or attribute name, and the part after it is the comparison value. For `email`, `firstName`, and `lastName`, provide the plain comparison string.
  - `subject` string
  - `previewText` string, nullable
  - `confirmLiveChange` boolean — Required as true when the sequence is active, the test is no longer a draft, or the test has recorded activity. Earlier sends remain unchanged, so combined results may no longer be accurate.

## Response `200`

Variant updated

- object
  - `success` boolean
  - `variant` ABTestVariant
    - `id` string
    - `variantId` string
    - `abTestId` string
    - `label` string
    - `variantLabel` string
    - `emailId` string
    - `subject` string
    - `previewText` string, nullable
    - `blocks` EmailBlock[]
      - `id` string
      - `type` 'text' | 'html' | 'heading' | 'list' | 'button' | 'spacer' | 'divider' | 'image' | 'columns' | 'conditional-group' | 'repeat' | 'card' | 'cta' | 'social' | 'logo' | 'header' | 'footer' | 'video' | 'product' | 'discount-code' | 'code' | 'countdown' | 'hero' | 'testimonial' | 'gallery' | 'badge' | 'table' | 'features' | 'image-card' | 'pricing' | 'author' | 'article' | 'rating' | 'stats' | 'steps' | 'product-grid' | 'poll', required
      - `content` string — Content for text, html, and heading-like blocks.
      - `styles` object — Per-block visual styles. For compatibility, style fields such as backgroundColor, backgroundOpacity, borderColor, borderWidth, and borderRadius can also be supplied at the block top level and are normalized into this object.
        - `paddingTop` number
        - `paddingBottom` number
        - `paddingLeft` number
        - `paddingRight` number
        - `backgroundColor` string
        - `backgroundOpacity` number — Background opacity percentage from 0 to 100.
        - `textColor` string
        - `textAlign` 'left' | 'center' | 'right'
        - `borderRadius` number
        - `borderColor` string
        - `borderWidth` number
        - `bleed` boolean — Stretch the block edge-to-edge across the email container. Top-level blocks only.
      - `conditions` object[] — Optional per-block display rules. The block renders only when every rule matches. The same shape is used for a conditional-group block's top-level `conditions`.
        - `id` string, required
        - `field` 'variable' | 'attribute' | 'email' | 'firstName' | 'lastName', required — `variable` resolves a merge-tag path from the transactional send `variables` or an automation `event` payload (nested paths like `order.total` or `event.plan` work). `attribute` reads a stored subscriber attribute. `email`, `firstName`, and `lastName` read core subscriber fields.
        - `operator` 'is' | 'is_not' | 'contains' | 'not_contains' | 'gt' | 'gte' | 'lt' | 'lte' | 'is_empty' | 'is_not_empty', required
        - `value` string, required — For `variable` and `attribute`, use `name:value` - the part before the colon is the variable path or attribute name, and the part after it is the comparison value. For `email`, `firstName`, and `lastName`, provide the plain comparison string.
    - `testSends` integer
    - `testOpens` integer
    - `testClicks` integer
    - `isWinner` boolean
    - `localizations` object[]
    - `createdAt` string, date-time
  - `warnings` string[] — Non-blocking advisories about a successful write. Present when an input was discarded or did not take effect as requested. This includes block fields that do not render as their names suggest, sequence email-step formatting restored on top of submitted blocks, and sender-identity conflicts such as a replyToName that differs from the saved profile. Each message identifies the affected input and gives recovery guidance. Absent when there is nothing to report.

## Other responses

- `400` — Validation error, immutable non-draft campaign A/B test, or missing live-change confirmation
- `401` — Unauthorized
- `404` — A/B test or variant not found
- `500` — Variant could not be updated

---

[API](https://skmtc.net/sequenzy/apis/sequenzy-api.md) · [All operations](https://skmtc.net/sequenzy/apis/sequenzy-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/sequenzy/sequenzy-api/revisions/af1cf9620482/schema)