Pairwise benchmark snapshot · Aug 16, 2026

Claude Opus 4.5 vs Claude Sonnet 4 benchmark

Name: Claude Opus 4.5 vs Claude Sonnet 4 AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares Claude Opus 4.5 (Anthropic) and Claude Sonnet 4 (Anthropic) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, Claude Opus 4.5 is ahead by 113 points (1,568 vs 1,455; seed-bootstrap (Aug 1, 2026)). On SWE-bench coding, Claude Opus 4.5 resolves 76.8% versus 62.8% (seed-bootstrap (Aug 1, 2026)). Claude Sonnet 4 streams faster (92 tok/s) while Claude Sonnet 4 is the cheaper output token ($15/1M). Claude Sonnet 4 has the larger context window (1M tokens). Every cell below is a dated snapshot from a named public source — we do not invent missing scores, and we do not run SWE-bench ourselves.

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Anthropic

Claude Opus 4.5

Anthropic frontier coding and computer-use model. SWE-bench leader on the official mini-SWE-agent harness in the Feb 2026 refresh.

Elo 1,568$25/1M out

Anthropic

Claude Sonnet 4

First Sonnet 4 generation. Bridge between 3.5/3.7 and Sonnet 5.

Elo 1,455$15/1M out

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Quick vs:vs Claude Opus 4.6 vs Claude Sonnet 4.5 vs Claude 3.7 Sonnet vs GPT-5

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Claude Opus 4.5 (5)vsClaude Sonnet 4 (5)

Claude Opus 4.5: 5W (50%)Overall: Even matchupClaude Sonnet 4: 5W (50%)

← Claude Opus 4.5Claude Sonnet 4 →

Claude Opus 4.5 (5/5)

Intelligence & Reasoning

Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy

Preference Elo

1,568vs1,455

Coding Elo

1,574vs1,468

SWE-bench

76.8%vs62.8%

LiveBench

71.2%vs63.2%

GPQA Diamond

84.1%vs76.4%

Claude Opus 4.5: 5WClaude Sonnet 4: 0W

Claude Sonnet 4 (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

62 tok/svs92 tok/s

Time to first token

380 msvs220 ms

Claude Opus 4.5: 0WClaude Sonnet 4: 2W

Claude Sonnet 4 (3/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$25/1Mvs$15/1M

Input price

$5/1Mvs$3/1M

Context window

200kvs1M

Claude Opus 4.5: 0WClaude Sonnet 4: 3W

Capability Matchup Radar

Multi-Dimensional Capability Radar

Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.

Tap any node to inspect

Percentile 0–100

Dimensional AdvantageEven 3–3

Preference Elo

Claude Opus 4.5

113 pts advantage

Throughput Speed

Claude Sonnet 4

30 tok/s faster

Price Efficiency

Claude Sonnet 4

$10.00/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

+8%1,568

EloHigh is better

1,455

Code Elo

High is better

+7%1,574

Code EloHigh is better

1,468

LiveBench

High is better

+13%71.2%

LiveBenchHigh is better

63.2%

SWE-bench

High is better

+22%76.8%

SWE-benchHigh is better

62.8%

GPQA

High is better

+10%84.1%

GPQAHigh is better

76.4%

TTFT

Low is better

380 ms

TTFTLow is better

220 ms+73%

Speed

High is better

62 tok/s

SpeedHigh is better

92 tok/s+48%

In $

Low is better

$5/1M

In $Low is better

$3/1M+67%

Out $

Low is better

$25/1M

Out $Low is better

$15/1M+67%

Context

High is better

200k

ContextHigh is better

1M+400%

Interactive Simulator

Workload Cost & Savings Calculator

Simulate monthly production API costs based on published $/1M tokens.

Save up to 40% with Claude Sonnet 4

Monthly Volume50M tokens/mo

Quick Presets:

Token Ratio (In vs Out)70% In / 30% Out

RAG / Search (10% out)Coding / Chat (50% out)

Claude Opus 4.5$550.00 / mo

In: $175.00Out: $375.00

Claude Sonnet 4$330.00 / mo

In: $105.00Out: $225.00

Estimated Cost Delta

Claude Sonnet 4 is estimated to save $220.00/month ($2,640/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

1
Claude Opus 4.5:Pick Claude Opus 4.5 when repo-level coding accuracy is the constraint.
2
Claude Sonnet 4:Pick Claude Sonnet 4 when you are optimizing output cost.
3
Claude Sonnet 4:Pick Claude Sonnet 4 when time-to-first-token matters more than peak Elo.

Recommended Workload Routing

Repo / coding agentsClaude Opus 4.5

Higher SWE-bench (76.8%).

High-volume chatClaude Sonnet 4

Lower output list price ($15/1M).

Voice / low-latency UIClaude Sonnet 4

Lower TTFT (220 ms).

Long-document RAGClaude Sonnet 4

Larger window (1M).

Screenshots / visionClaude Opus 4.5

Both accept images. Defaulting to the higher-Elo side (Claude Opus 4.5).

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Claude Opus 4.5	Higher SWE-bench (76.8%).
High-volume chat	Claude Sonnet 4	Lower output list price ($15/1M).
Voice / low-latency UI	Claude Sonnet 4	Lower TTFT (220 ms).
Long-document RAG	Claude Sonnet 4	Larger window (1M).
Screenshots / vision	Claude Opus 4.5	Both accept images. Defaulting to the higher-Elo side (Claude Opus 4.5).

Related Editorial Dispatches & Benchmark Notes

View all news

launchFeb 20, 2026

Claude Opus 4.5 and the Feb 2026 SWE-bench row we still cite

The Feb refresh made 4.5 a coding reference. Newer Opus SKUs exist; this row stays as the dated harness point.

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LIVE

Anthropic

Claude Opus 4.5

Elo 1,568

LiveBench71.2%

SWE-bench76.8%

Speed62 tok/s

Output cost$25/1M

Anthropic

Claude Sonnet 4

Elo 1,455

LiveBench63.2%

SWE-bench62.8%

Speed92 tok/s

Output cost$15/1M

Frequently Asked Questions

Which is better overall, Claude Opus 4.5 or Claude Sonnet 4?: Claude Opus 4.5 has the higher preference Elo in our latest snapshot (1,568). “Better” still depends on coding, price, and latency — see the table.
Which is better at coding, Claude Opus 4.5 or Claude Sonnet 4?: Claude Opus 4.5 leads SWE-bench at 76.8% vs 62.8%. SWE-bench is one harness, not your repo.
Which is cheaper to run in production?: Claude Sonnet 4 output tokens are $15/1M versus $25/1M. Input prices and retry rates still move the real bill.
Which is faster, Claude Opus 4.5 or Claude Sonnet 4?: Claude Sonnet 4 has the lower time-to-first-token (220 ms vs 380 ms). Tokens/sec is a separate column if you care about long completions.
Which has the larger context window?: Claude Sonnet 4 accepts 1M tokens versus 200k.
Can I self-host either model?: Neither model is marked open-weights here. You are comparing hosted APIs.
Are these scores from CompareLLM’s own evals?: No. V1 aggregates public leaderboards (and optional first-party latency pings). Each cell names its source and date. Read /methodology.
What does preference Elo mean on this page?: Preference Elo is a crowd vote from LMArena / Arena. People see two hidden answers and pick the one they like more. The model that wins more often gets a higher Elo. That means people preferred it — not that it passed a school test. It is not SWE-bench, not accuracy, and not a number we invent. Claude Opus 4.5 and Claude Sonnet 4 Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Similar Head-to-Head Comparisons

All Claude Opus 4.5 matchups →|All Claude Sonnet 4 matchups →

Claude Opus 4.5 vs Claude Opus 4 (previous opus)Claude Opus 4.5 vs Claude Opus 4.6 (next opus)Claude Sonnet 4 vs Claude 3.7 Sonnet (previous sonnet)Claude Sonnet 4 vs Claude Sonnet 4.5 (next sonnet)Claude Sonnet 5 vs Claude Opus 4.5 Claude Opus 4.8 vs Claude Opus 4.5

Claude Opus 4.5 vs Claude Sonnet 4 benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Claude Opus 4.5 (5)vsClaude Sonnet 4 (5)

Claude Opus 4.5: 5W (50%)Overall: Even matchupClaude Sonnet 4: 5W (50%)

← Claude Opus 4.5Claude Sonnet 4 →

Claude Opus 4.5 (5/5)

Intelligence & Reasoning

Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy

Preference Elo

1,568vs1,455

Coding Elo

1,574vs1,468

SWE-bench

76.8%vs62.8%

LiveBench

71.2%vs63.2%

GPQA Diamond

84.1%vs76.4%

Claude Opus 4.5: 5WClaude Sonnet 4: 0W

Claude Sonnet 4 (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

62 tok/svs92 tok/s

Time to first token

380 msvs220 ms

Claude Opus 4.5: 0WClaude Sonnet 4: 2W

Claude Sonnet 4 (3/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$25/1Mvs$15/1M

Input price

$5/1Mvs$3/1M

Context window

200kvs1M

Claude Opus 4.5: 0WClaude Sonnet 4: 3W

Recommended Workload Routing

Repo / coding agentsClaude Opus 4.5

Higher SWE-bench (76.8%).

High-volume chatClaude Sonnet 4

Lower output list price ($15/1M).

Voice / low-latency UIClaude Sonnet 4

Lower TTFT (220 ms).

Long-document RAGClaude Sonnet 4

Larger window (1M).

Screenshots / visionClaude Opus 4.5

Both accept images. Defaulting to the higher-Elo side (Claude Opus 4.5).

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Claude Opus 4.5	Higher SWE-bench (76.8%).
High-volume chat	Claude Sonnet 4	Lower output list price ($15/1M).
Voice / low-latency UI	Claude Sonnet 4	Lower TTFT (220 ms).
Long-document RAG	Claude Sonnet 4	Larger window (1M).
Screenshots / vision	Claude Opus 4.5	Both accept images. Defaulting to the higher-Elo side (Claude Opus 4.5).

Frequently Asked Questions

Which is better overall, Claude Opus 4.5 or Claude Sonnet 4?

Claude Opus 4.5 has the higher preference Elo in our latest snapshot (1,568). “Better” still depends on coding, price, and latency — see the table.

Which is better at coding, Claude Opus 4.5 or Claude Sonnet 4?

Claude Opus 4.5 leads SWE-bench at 76.8% vs 62.8%. SWE-bench is one harness, not your repo.

Which is cheaper to run in production?

Claude Sonnet 4 output tokens are $15/1M versus $25/1M. Input prices and retry rates still move the real bill.

Which is faster, Claude Opus 4.5 or Claude Sonnet 4?

Claude Sonnet 4 has the lower time-to-first-token (220 ms vs 380 ms). Tokens/sec is a separate column if you care about long completions.

Which has the larger context window?

Claude Sonnet 4 accepts 1M tokens versus 200k.

Can I self-host either model?

Neither model is marked open-weights here. You are comparing hosted APIs.

Are these scores from CompareLLM’s own evals?

No. V1 aggregates public leaderboards (and optional first-party latency pings). Each cell names its source and date. Read /methodology.

What does preference Elo mean on this page?

Preference Elo is a crowd vote from LMArena / Arena. People see two hidden answers and pick the one they like more. The model that wins more often gets a higher Elo. That means people preferred it — not that it passed a school test. It is not SWE-bench, not accuracy, and not a number we invent. Claude Opus 4.5 and Claude Sonnet 4 Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Swap or Add Any Model to this Matchup

Interactive Comparison Diagram

Tug-of-War Matchup Matrix

Intelligence & Reasoning

Speed & Latency

Pricing & Capacity

Multi-Dimensional Capability Radar

Claude Opus 4.5

Claude Sonnet 4

Claude Sonnet 4

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Claude Opus 4.5 and the Feb 2026 SWE-bench row we still cite

Cast Your Matchup Vote

Community Discussions (0)

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CompareLLM Matrix

Claude Opus 4.5

Claude Sonnet 4

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons

Swap or Add Any Model to this Matchup

Interactive Comparison Diagram

Tug-of-War Matchup Matrix

Intelligence & Reasoning

Speed & Latency

Pricing & Capacity

Multi-Dimensional Capability Radar

Claude Opus 4.5

Claude Sonnet 4

Claude Sonnet 4

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Claude Opus 4.5 and the Feb 2026 SWE-bench row we still cite

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

Claude Opus 4.5

Claude Sonnet 4

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons