artificialwatch

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GPT-5.6 vs Claude Opus 4.8

GPT-5.6 scores higher than Claude Opus 4.8 on all 3 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GPT-5.6 is at 48.1 and Claude Opus 4.8 at 30.6 (out of 100). On each maker's API, GPT-5.6 costs $4 / $20 per 1M tokens (input / output) and Claude Opus 4.8 $5 / $25.

Scores as published by each board; table composed November 10, 2026.

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Leaderboard by leaderboard

BoardGPT-5.6Claude Opus 4.8Higher
LMArena
Elo (community votes)
1,615.31,555.4GPT-5.6
SimpleBench
AVG@5 % (private set)
71.764.8GPT-5.6
Epoch AI
Epoch Capabilities Index (ECI) · many benchmarks on one scale
163159.9GPT-5.6

Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.

For coding

On the ArtificialWatch coding index, GPT-5.6 is at 57.1 (#18 of 47) and Claude Opus 4.8 at 52.4 (#19). GPT-5.6 scores higher on 1 of the 2 coding boards that rate both and Claude Opus 4.8 on 1.

Coding boardGPT-5.6Claude Opus 4.8
LMArena · Coding1,495.21,490.7
Vals Vibe Code Bench80.582.7

The full AI coding leaderboard →

GPT-5.6 at a glance

Developer
OpenAI
Status
Live since July 9, 2026
API price
$4 input / $20 output per 1M tokens · OpenAI, gpt-5.6
Context window
1.05M tokens

Live — Sol · Terra · Luna since Jul 9 · repriced Jul 30: Luna −80%, Terra −20%.

OpenAI Daybreak, explained: Blue vs Red access, GPT-5.6-Cyber, the $1B defender fund, and Sophos's 89-second cases

2026-10-12 · OpenAI Daybreak is OpenAI's program for putting its most cyber-capable models in the hands of approved defenders. On October 9 OpenAI published its first big customer result: Sophos says agents it built on Daybreak cut its average response time on those cases from about 38 minutes to about 89 seconds.

Three ChatGPT leaks in five hours were one release note — and the line none of them quoted is the real change

2026-08-06 · Three separate leaks landed in five hours claiming three separate ChatGPT changes: an upgraded GPT-5.6 Sol for Plus and Pro, a new reasoning slider rolling out, and unlimited chats coming for free users. All three are real.

Full GPT-5.6 tracker →

Claude Opus 4.8 at a glance

Developer
Anthropic
Status
Live since May 27, 2026
API price
$5 input / $25 output per 1M tokens · Anthropic, claude-opus-4-8
Context window
1M tokens

Live.

Full Claude Opus 4.8 tracker →

GPT-5.6 vs Claude Opus 4.8: quick answers

Which is better, GPT-5.6 or Claude Opus 4.8?

It depends on what you measure. GPT-5.6 scores higher than Claude Opus 4.8 on all 3 public leaderboards that rate both. GPT-5.6's widest lead is on LMArena. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GPT-5.6 is at 48.1 and Claude Opus 4.8 at 30.6 (out of 100).

Which is newer, GPT-5.6 or Claude Opus 4.8?

GPT-5.6. It went live on July 9, 2026, 43 days after Claude Opus 4.8 (May 27, 2026).

Which is cheaper, GPT-5.6 or Claude Opus 4.8?

GPT-5.6 is cheaper on both input and output. On each vendor's own API, GPT-5.6 is $4 input / $20 output per million tokens and Claude Opus 4.8 is $5 input / $25 output per million tokens. GPT-5.6's rate rises for prompts over 272K tokens. Prices as published in the models.dev catalog, as of 2026-11-10.

Which has the bigger context window, GPT-5.6 or Claude Opus 4.8?

GPT-5.6, at 1.05M tokens against Claude Opus 4.8's 1M, as each vendor lists it.

How do GPT-5.6 and Claude Opus 4.8 compare for coding?

On the ArtificialWatch coding index, GPT-5.6 is at 57.1 (#18 of 47) and Claude Opus 4.8 at 52.4 (#19). GPT-5.6 scores higher on 1 of the 2 coding boards that rate both and Claude Opus 4.8 on 1.

Who makes GPT-5.6 and Claude Opus 4.8?

GPT-5.6 is from OpenAI; Claude Opus 4.8 is from Anthropic.

Where do these numbers come from?

Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed November 10, 2026). Boards measure different things, so raw scores are only comparable within a row.

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