Pairwise benchmark snapshot · Aug 16, 2026

Claude Sonnet 4.5 vs OpenAI o1-mini benchmark

Name: Claude Sonnet 4.5 vs OpenAI o1-mini AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares Claude Sonnet 4.5 (Anthropic) and OpenAI o1-mini (OpenAI) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, Claude Sonnet 4.5 is ahead by 79 points (1,524 vs 1,445; seed-bootstrap (Aug 1, 2026)). On SWE-bench coding, Claude Sonnet 4.5 resolves 70.1% versus 56.4% (seed-bootstrap (Aug 1, 2026)). Claude Sonnet 4.5 streams faster (88 tok/s) while OpenAI o1-mini is the cheaper output token ($4.4/1M). Claude Sonnet 4.5 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.

Share Analysis:

WhatsApp Telegram X / Post LinkedIn Reddit

Anthropic

Claude Sonnet 4.5

Workhorse Anthropic model: most of Opus coding quality at a mid-tier price.

Elo 1,524$15/1M out

OpenAI

OpenAI o1-mini

OpenAI high-speed, cost-effective reasoning model optimized for STEM, math, and code generation.

Elo 1,445$4.4/1M out

Swap or Add Any Model to this Matchup

Instant pairwise benchmark recalculation across 400+ LLMs

Model A

Model B

Quick vs:vs Claude Opus 4.5 vs Claude Opus 4.6 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 Sonnet 4.5 (8)vsOpenAI o1-mini (2)

Claude Sonnet 4.5: 8W (80%)Overall: Claude Sonnet 4.5OpenAI o1-mini: 2W (20%)

← Claude Sonnet 4.5OpenAI o1-mini →

Claude Sonnet 4.5 (5/5)

Intelligence & Reasoning

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

Preference Elo

1,524vs1,445

Coding Elo

1,531vs1,468

SWE-bench

70.1%vs56.4%

LiveBench

67.4%vs62%

GPQA Diamond

80.2%vs76.8%

Claude Sonnet 4.5: 5WOpenAI o1-mini: 0W

Claude Sonnet 4.5 (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

88 tok/svs85 tok/s

Time to first token

240 msvs280 ms

Claude Sonnet 4.5: 2WOpenAI o1-mini: 0W

OpenAI o1-mini (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$15/1Mvs$4.4/1M

Input price

$3/1Mvs$1.1/1M

Context window

1Mvs128k

Claude Sonnet 4.5: 1WOpenAI o1-mini: 2W

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 AdvantageClaude Sonnet 4.5 5/6

Preference Elo

Claude Sonnet 4.5

79 pts advantage

Throughput Speed

Claude Sonnet 4.5

3 tok/s faster

Price Efficiency

OpenAI o1-mini

$10.60/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

+5%1,524

EloHigh is better

1,445

Code Elo

High is better

+4%1,531

Code EloHigh is better

1,468

LiveBench

High is better

+9%67.4%

LiveBenchHigh is better

62%

SWE-bench

High is better

+24%70.1%

SWE-benchHigh is better

56.4%

GPQA

High is better

+4%80.2%

GPQAHigh is better

76.8%

TTFT

Low is better

+17%240 ms

TTFTLow is better

280 ms

Speed

High is better

+4%88 tok/s

SpeedHigh is better

85 tok/s

In $

Low is better

$3/1M

In $Low is better

$1.1/1M+173%

Out $

Low is better

$15/1M

Out $Low is better

$4.4/1M+241%

Context

High is better

+681%1M

ContextHigh is better

128k

Interactive Simulator

Workload Cost & Savings Calculator

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

Save up to 68% with OpenAI o1-mini

Monthly Volume50M tokens/mo

Quick Presets:

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

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

Claude Sonnet 4.5$330.00 / mo

In: $105.00Out: $225.00

OpenAI o1-mini$104.50 / mo

In: $38.50Out: $66.00

Estimated Cost Delta

OpenAI o1-mini is estimated to save $225.50/month ($2,706/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

1
Claude Sonnet 4.5:Pick Claude Sonnet 4.5 when repo-level coding accuracy is the constraint.
2
OpenAI o1-mini:Pick OpenAI o1-mini when you are optimizing output cost.
3
Claude Sonnet 4.5:Pick Claude Sonnet 4.5 when time-to-first-token matters more than peak Elo.

Recommended Workload Routing

Repo / coding agentsClaude Sonnet 4.5

Higher SWE-bench (70.1%).

High-volume chatOpenAI o1-mini

Lower output list price ($4.4/1M).

Voice / low-latency UIClaude Sonnet 4.5

Lower TTFT (240 ms).

Long-document RAGClaude Sonnet 4.5

Larger window (1M).

Screenshots / visionClaude Sonnet 4.5

Claude Sonnet 4.5 is the side marked multimodal in the catalog.

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Claude Sonnet 4.5	Higher SWE-bench (70.1%).
High-volume chat	OpenAI o1-mini	Lower output list price ($4.4/1M).
Voice / low-latency UI	Claude Sonnet 4.5	Lower TTFT (240 ms).
Long-document RAG	Claude Sonnet 4.5	Larger window (1M).
Screenshots / vision	Claude Sonnet 4.5	Claude Sonnet 4.5 is the side marked multimodal in the catalog.

Related Editorial Dispatches & Benchmark Notes

View all news

launchFeb 18, 2026

Claude Sonnet 4.5 is the previous workhorse — still a valid vs baseline

Most of Opus 4.5 coding at a mid-tier price. Sonnet 5 replaced it as the buy; 4.5 remains a compare baseline.

Community Sentiment

Cast Your Matchup Vote

0 total votes

Community Discussions (0)

No comments posted on this matchup yet. Be the first to share an evaluation note!

Share card

The real PNG is generated at /compare/claude-sonnet-4-5-vs-o1-mini/opengraph-image for crawlers.

PNG

CompareLLM Matrix

Verified head-to-head card

LIVE

Anthropic

Claude Sonnet 4.5

Elo 1,524

LiveBench67.4%

SWE-bench70.1%

Speed88 tok/s

Output cost$15/1M

OpenAI

OpenAI o1-mini

Elo 1,445

LiveBench62%

SWE-bench56.4%

Speed85 tok/s

Output cost$4.4/1M

Frequently Asked Questions

Which is better overall, Claude Sonnet 4.5 or OpenAI o1-mini?: Claude Sonnet 4.5 has the higher preference Elo in our latest snapshot (1,524). “Better” still depends on coding, price, and latency — see the table.
Which is better at coding, Claude Sonnet 4.5 or OpenAI o1-mini?: Claude Sonnet 4.5 leads SWE-bench at 70.1% vs 56.4%. SWE-bench is one harness, not your repo.
Which is cheaper to run in production?: OpenAI o1-mini output tokens are $4.4/1M versus $15/1M. Input prices and retry rates still move the real bill.
Which is faster, Claude Sonnet 4.5 or OpenAI o1-mini?: Claude Sonnet 4.5 has the lower time-to-first-token (240 ms vs 280 ms). Tokens/sec is a separate column if you care about long completions.
Which has the larger context window?: Claude Sonnet 4.5 accepts 1M tokens versus 128k.
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 Sonnet 4.5 and OpenAI o1-mini Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Similar Head-to-Head Comparisons

All Claude Sonnet 4.5 matchups →|All OpenAI o1-mini matchups →

Claude Sonnet 4.5 vs Claude Sonnet 4 (previous sonnet)Claude Sonnet 4.5 vs Claude Sonnet 5 (next sonnet)OpenAI o1-mini vs GPT-4o mini (previous gpt-mini)OpenAI o1-mini vs OpenAI: o3 Mini (next gpt-mini)GPT-4.5 Orion vs Claude Sonnet 4.5 GPT-5.6 Terra vs Claude Sonnet 4.5

Claude Sonnet 4.5 vs OpenAI o1-mini benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Claude Sonnet 4.5 (8)vsOpenAI o1-mini (2)

Claude Sonnet 4.5: 8W (80%)Overall: Claude Sonnet 4.5OpenAI o1-mini: 2W (20%)

← Claude Sonnet 4.5OpenAI o1-mini →

Claude Sonnet 4.5 (5/5)

Intelligence & Reasoning

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

Preference Elo

1,524vs1,445

Coding Elo

1,531vs1,468

SWE-bench

70.1%vs56.4%

LiveBench

67.4%vs62%

GPQA Diamond

80.2%vs76.8%

Claude Sonnet 4.5: 5WOpenAI o1-mini: 0W

Claude Sonnet 4.5 (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

88 tok/svs85 tok/s

Time to first token

240 msvs280 ms

Claude Sonnet 4.5: 2WOpenAI o1-mini: 0W

OpenAI o1-mini (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$15/1Mvs$4.4/1M

Input price

$3/1Mvs$1.1/1M

Context window

1Mvs128k

Claude Sonnet 4.5: 1WOpenAI o1-mini: 2W

Recommended Workload Routing

Repo / coding agentsClaude Sonnet 4.5

Higher SWE-bench (70.1%).

High-volume chatOpenAI o1-mini

Lower output list price ($4.4/1M).

Voice / low-latency UIClaude Sonnet 4.5

Lower TTFT (240 ms).

Long-document RAGClaude Sonnet 4.5

Larger window (1M).

Screenshots / visionClaude Sonnet 4.5

Claude Sonnet 4.5 is the side marked multimodal in the catalog.

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	Claude Sonnet 4.5	Higher SWE-bench (70.1%).
High-volume chat	OpenAI o1-mini	Lower output list price ($4.4/1M).
Voice / low-latency UI	Claude Sonnet 4.5	Lower TTFT (240 ms).
Long-document RAG	Claude Sonnet 4.5	Larger window (1M).
Screenshots / vision	Claude Sonnet 4.5	Claude Sonnet 4.5 is the side marked multimodal in the catalog.

Frequently Asked Questions

Which is better overall, Claude Sonnet 4.5 or OpenAI o1-mini?

Claude Sonnet 4.5 has the higher preference Elo in our latest snapshot (1,524). “Better” still depends on coding, price, and latency — see the table.

Which is better at coding, Claude Sonnet 4.5 or OpenAI o1-mini?

Claude Sonnet 4.5 leads SWE-bench at 70.1% vs 56.4%. SWE-bench is one harness, not your repo.

Which is cheaper to run in production?

OpenAI o1-mini output tokens are $4.4/1M versus $15/1M. Input prices and retry rates still move the real bill.

Which is faster, Claude Sonnet 4.5 or OpenAI o1-mini?

Claude Sonnet 4.5 has the lower time-to-first-token (240 ms vs 280 ms). Tokens/sec is a separate column if you care about long completions.

Which has the larger context window?

Claude Sonnet 4.5 accepts 1M tokens versus 128k.

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 Sonnet 4.5 and OpenAI o1-mini 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 Sonnet 4.5

Claude Sonnet 4.5

OpenAI o1-mini

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Claude Sonnet 4.5 is the previous workhorse — still a valid vs baseline

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

Claude Sonnet 4.5

OpenAI o1-mini

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 Sonnet 4.5

Claude Sonnet 4.5

OpenAI o1-mini

Full Benchmark Score Matrix

Workload Cost & Savings Calculator

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Claude Sonnet 4.5 is the previous workhorse — still a valid vs baseline

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

Claude Sonnet 4.5

OpenAI o1-mini

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons