LG OLED77B5PUA 77" Class B5 Series OLED AI 4K UHD Smart webOS TV vs LG 55CXPUA OLED 55" TV

Name: LG OLED77B5PUA 77" Class B5 Series OLED AI 4K UHD Smart webOS TV vs LG 55CXPUA OLED 55" TV — Comparison Review
Item: LG OLED77B5PUA 77" Class B5 Series OLED AI 4K UHD Smart webOS TV vs LG 55CXPUA OLED 55" TV
Rating: 8.2
Author: Billy G.

By Billy G. · Founder & Lead EditorVerified Oct 19 by Billy G.

LG OLED77B5PUA 77"

LG OLED77B5PUA 77" Class B5 Series OLED AI 4K UHD Smart webOS TV

LG 55CXPUA OLED

LG 55CXPUA OLED 55" TV

Decision sheet: the facts that decide it

LG OLED77B5PUA 77" Class B5 Series OLED AI 4K UHD Smart webOS TV: 7 of 10 decision facts sourced.

LG 55CXPUA OLED 55" TV: 1 of 10 decision facts sourced. Missing: Screen size, Panel, Resolution, Refresh rate, HDR, Peak brightness, HDMI 2.1 ports, VRR / ALLM, and 1 more.

	LG OLED77B5PUA 77" Class B5 Series OLED AI 4K UHD Smart webOS TV	LG 55CXPUA OLED 55" TV
Price today	Price not yet checked	Price not yet checked
Screen size	77 inches bestbuy.com	Not yet sourced
Panel	OLED bestbuy.com	Not yet sourced
Resolution	4K (2160p) bestbuy.com	Not yet sourced
Refresh rate	120Hz bestbuy.com	Not yet sourced
HDR	Yes bestbuy.com	Not yet sourced
Smart platform	webOS bestbuy.com	Not yet sourced
Starting MSRP	$2,999.99 bestbuy.com	$1,799.99 lg.com

Not yet sourced — LG OLED77B5PUA 77" Class B5 Series OLED AI 4K UHD Smart webOS TV: Peak brightness, HDMI 2.1 ports, VRR / ALLM. LG 55CXPUA OLED 55" TV: Screen size, Panel, Resolution, Refresh rate, HDR, Peak brightness, HDMI 2.1 ports, VRR / ALLM, Smart platform. No manufacturer, official or retailer source we read publishes these yet; we don't estimate them.

Pick LG 55CXPUA OLED 55" TV if

Lower starting price — $1,799 vs $2,999 (bestbuy.com, lg.com)

Skip both if

Neither publishes peak brightness, HDMI 2.1 ports or VRR / ALLM yet.

The LG OLED77B5PUA 77" Class B5 Series OLED AI 4K UHD Smart webOS TV. And the LG 55CXPUA OLED 55" TV both rely on self-emissive OLED panels that deliver perfect blacks. And wide viewing angles, yet they target noticeably different budgets and screen sizes. Public specifications show the larger B5 model carries a starting price of $2,999 while the 55-inch CX starts at $1,799, a gap that reflects the added real estate and newer processor inside the B5. Review aggregates note the CX’s established reputation for responsive gaming features, although neither manufacturer has yet published exact peak brightness figures, confirmed HDMI 2.1 port counts, or official VRR and ALLM support for the B5. Differences in processing power, smart platform refinements, and long-term software updates also surface across professional breakdowns. The short version: buyers prioritizing screen size on a tighter budget may favor the value-oriented 55CX, while those seeking the immersive scale of 77 inches will weigh the higher cost of the B5 against its incremental upgrades.

Verdict: On the figures both makers publish, the LG 55CXPUA OLED 55" TV leads with lower starting price ($1,799 vs $2,999). Neither publishes peak brightness, HDMI 2.1 ports or VRR / ALLM yet.

Provisional pick: LG OLED77B5PUA 77" Class B5 Series OLED AI 4K UHD Smart webOS TV — not enough sourced decision facts for LG 55CXPUA OLED 55" TV. We don't rank on specs we can't verify.

Spec-by-spec comparison

	LG OLED77B5PUA 77" Class B5 Series OLED AI 4K UHD Smart webOS TV	LG 55CXPUA OLED 55" TV
Screen size	77 inches	—
Panel	OLED	—
Resolution	4K (2160p)	—
Refresh rate	120Hz	—
HDR	Yes	—
HDMI ports	4	—

LG OLED77B5PUA 77" Class B5 Series OLED AI 4K UHD Smart webOS TV

What works

Largest screen in the pair at 77 inches
Four HDMI inputs for extensive connectivity
eARC support for high‑quality audio

What doesn't

Higher price at $2,999.99

LG 55CXPUA OLED 55" TV

What works

More affordable at $1,799.99
OLED technology delivers deep blacks
Compact size fits smaller rooms

What doesn't

Limited connectivity information may affect expandability

Bottom line

Provisional pick: LG OLED77B5PUA 77" Class B5 Series OLED AI 4K UHD Smart webOS TV — not enough sourced decision facts for LG 55CXPUA OLED 55" TV.

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