Which is better, Claude Sonnet 5.5 or GPT-5.5?

On quality, neither model leads clearly across the 9 measures both have. 5 measures are too close to call. Claude Sonnet 5.5 costs about 64% less than GPT-5.5 on a blended price of $4.00 against $11.25 per million tokens. Which one is better for you depends on your task and budget, so test both on your own work.

Which is cheaper, Claude Sonnet 5.5 or GPT-5.5?

Claude Sonnet 5.5 is cheaper on blended price: $4.00 per million tokens for Claude Sonnet 5.5 against $11.25 for GPT-5.5. For 100 chats of about 1,000 tokens in and 500 tokens back, that is about $0.70 for Claude Sonnet 5.5 and $2 for GPT-5.5.

Which is better for coding, Claude Sonnet 5.5 or GPT-5.5?

On Arena coding rating they are too close to call (1528 and 1519).

AI Rankings

Claude Sonnet 5.5 vs GPT-5.5: Scores, Price and Which to Choose

Side by side on every measure both models share: overall score, human votes, tests, price and context window. Close results are called too close to call.

Data updated 26 Oct 2026

Read the model pages for the full picture: Claude Sonnet 5.5 and GPT-5.5.

Side by side

A check mark shows the better side on each measure. Scores that are too close to call have no winner.

Claude Sonnet 5.5 compared with GPT-5.5Claude Sonnet 5.5 against GPT-5.5 on 11 measures. Claude Sonnet 5.5 is better on 3, GPT-5.5 on 2, 6 are too close to call, 0 have no data for one side.

Claude Sonnet 5.5
GPT-5.5

Epoch Capabilities IndexToo close to call
Combined score over many tests. Bar shows where it sits between the lowest and highest score we track.
Claude Sonnet 5.5:
166.2
GPT-5.5:
159.7
Arena text ratingToo close to call
Rating from head-to-head votes by people. Bar shows where it sits between the lowest and highest score we track.
Claude Sonnet 5.5:
1478
GPT-5.5:
1482
Arena coding ratingToo close to call
Rating from head-to-head votes by people. Bar shows where it sits between the lowest and highest score we track.
Claude Sonnet 5.5:
1528
GPT-5.5:
1519
Arena web development ratingClaude Sonnet 5.5 leads
Rating from head-to-head votes by people. Bar shows where it sits between the lowest and highest score we track.
Claude Sonnet 5.5:
Better: 1769
GPT-5.5:
1513
Arena vision ratingGPT-5.5 leads
Rating from head-to-head votes by people. Bar shows where it sits between the lowest and highest score we track.
Claude Sonnet 5.5:
1265
GPT-5.5:
Better: 1286
FrontierMath (Tiers 1-3)Claude Sonnet 5.5 leads
Original, very hard maths problems written by mathematicians.
Claude Sonnet 5.5:
Better: 88.8%
GPT-5.5:
85.3%
GPQA DiamondToo close to call
Very hard multiple-choice science questions in biology, physics and chemistry, written by experts and designed so a quick web search does not give the answer.
Claude Sonnet 5.5:
95.6%
GPT-5.5:
94.0%
OTIS Mock AIMEToo close to call
Maths competition problems in the style of the US AIME exam, from the 2024 and 2025 sets.
Claude Sonnet 5.5:
100.0%
GPT-5.5:
100.0%
SimpleQA VerifiedGPT-5.5 leads
Short factual questions that each have one correct answer.
Claude Sonnet 5.5:
46.5%
GPT-5.5:
Better: 63.0%
Blended price per million tokensClaude Sonnet 5.5 costs less
Blended price: lower is better.
Claude Sonnet 5.5:
Better: $4.00
GPT-5.5:
$11.25
Context windowToo close to call
How much text it can read at once.
Claude Sonnet 5.5:
1M tokens
GPT-5.5:
1.1M tokens

Data updated 26 Oct 2026. Only measures that both models have are shown.

The numbers

Claude Sonnet 5.5 against GPT-5.5, measure by measure. A check mark shows the better side.
Measure	Claude Sonnet 5.5	GPT-5.5
Epoch Capabilities IndexToo close to call	166.2	159.7
Arena text ratingToo close to call	1478	1482
Arena coding ratingToo close to call	1528	1519
Arena web development rating	1769	1513
Arena vision rating	1265	1286
FrontierMath (Tiers 1-3)	88.8%	85.3%
GPQA DiamondToo close to call	95.6%	94.0%
OTIS Mock AIMEToo close to call	100.0%	100.0%
SimpleQA Verified	46.5%	63.0%
Blended price per million tokens	$4.00	$11.25
Context windowToo close to call	1M tokens	1.1M tokens

What it costs in everyday terms

Estimate for 100 chats of about 1,000 tokens in and 500 tokens back, from list prices. Your bill depends on how you use it.

100 chats with Claude Sonnet 5.5: $0.70; Blended price $4.00 per million tokens.
100 chats with GPT-5.5: $2; Blended price $11.25 per million tokens.

Who should pick which

Pick Claude Sonnet 5.5 if these matter most

Arena web development rating: 1769 against 1513
FrontierMath (Tiers 1-3): 88.8% against 85.3%
Blended price per million tokens: $4.00 against $11.25

Pick GPT-5.5 if these matter most

Arena vision rating: 1286 against 1265
SimpleQA Verified: 63.0% against 46.5%

Too close to call: Epoch Capabilities Index, Arena text rating, Arena coding rating, GPQA Diamond, OTIS Mock AIME, Context window.

Scores come from tests and votes, not from your own work. Try both on a task you care about before you commit.

Go deeper

Claude Sonnet 5.5: full page

GPT-5.5: full page

Questions about this comparison

Which is better, Claude Sonnet 5.5 or GPT-5.5?: On quality, neither model leads clearly across the 9 measures both have. 5 measures are too close to call. Claude Sonnet 5.5 costs about 64% less than GPT-5.5 on a blended price of $4.00 against $11.25 per million tokens. Which one is better for you depends on your task and budget, so test both on your own work.
Which is cheaper, Claude Sonnet 5.5 or GPT-5.5?: Claude Sonnet 5.5 is cheaper on blended price: $4.00 per million tokens for Claude Sonnet 5.5 against $11.25 for GPT-5.5. For 100 chats of about 1,000 tokens in and 500 tokens back, that is about $0.70 for Claude Sonnet 5.5 and $2 for GPT-5.5.
Which is better for coding, Claude Sonnet 5.5 or GPT-5.5?: On Arena coding rating they are too close to call (1528 and 1519).

Where this data comes from

Epoch AI: Benchmark data: Epoch AI, 'Capabilities & benchmarking', epoch.ai/benchmarks (CC BY 4.0). We match models across sources, rank them and show them in charts. Scores are not changed. Epoch AI does not endorse this site.
Arena (formerly LMArena): Human-preference ratings: Arena (arena.ai) leaderboard dataset, CC BY 4.0. We keep the latest published ratings, match them to models from other sources and rank them. Ratings are not changed. Arena does not endorse this site.
LiteLLM model price list: Prices and context windows: LiteLLM model price list (github.com/BerriAI/litellm, MIT licence). We use the model maker's own price entry when there is one. Prices change often, so always confirm on the maker's site before you buy.

Newest data on this page: 26 Oct 2026. Prices are list prices and change often, so confirm on the maker's site before you buy. Sponsors never change a score or an order. How we calculate this · Report a mistake