diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9601811b1..31b0d4011 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@
 - TUI: show provider/model labels for the active session and default model.
 - Heartbeat: add per-agent heartbeat configuration and multi-agent docs example.
 - Fix: list model picker entries as provider/model pairs for explicit selection. (#970) — thanks @mcinteerj.
+- Fix: align OpenAI image-gen defaults with DALL-E 3 standard quality and document output formats. (#880) — thanks @mkbehr.
 - Fix: persist `gateway.mode=local` after selecting Local run mode in `clawdbot configure`, even if no other sections are chosen.
 - Daemon: fix profile-aware service label resolution (env-driven) and add coverage for launchd/systemd/schtasks. (#969) — thanks @bjesuiter.
 - Daemon: share profile/state-dir resolution across service helpers and honor `CLAWDBOT_STATE_DIR` for Windows task scripts.
diff --git a/skills/openai-image-gen/SKILL.md b/skills/openai-image-gen/SKILL.md
index 0d5f32492..d1ebb1236 100644
--- a/skills/openai-image-gen/SKILL.md
+++ b/skills/openai-image-gen/SKILL.md
@@ -66,6 +66,6 @@ Different models support different parameter values. The script automatically se
 
 ## Output
 
-- `*.png` images
+- `*.png`, `*.jpeg`, or `*.webp` images (output format depends on model + `--output-format`)
 - `prompts.json` (prompt → file mapping)
 - `index.html` (thumbnail gallery)
diff --git a/skills/openai-image-gen/scripts/gen.py b/skills/openai-image-gen/scripts/gen.py
index d09c33bbc..8024b055b 100644
--- a/skills/openai-image-gen/scripts/gen.py
+++ b/skills/openai-image-gen/scripts/gen.py
@@ -68,7 +68,7 @@ def get_model_defaults(model: str) -> tuple[str, str]:
         # quality will be ignored
         return ("1024x1024", "standard")
     elif model == "dall-e-3":
-        return ("1024x1024", "hd")
+        return ("1024x1024", "standard")
     else:
         # GPT image or future models
         return ("1024x1024", "high")