Pairwise benchmark snapshot · Aug 16, 2026

Claude Opus 4.5 vs Grok 4 benchmark

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

This page compares Claude Opus 4.5 (Anthropic) and Grok 4 (xAI) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, Claude Opus 4.5 is ahead by 80 points (1,568 vs 1,488; seed-bootstrap (Aug 1, 2026)). On SWE-bench coding, Claude Opus 4.5 resolves 76.8% versus 58.6% (seed-bootstrap (Aug 1, 2026)). Grok 4 streams faster (98 tok/s) while Grok 4 is the cheaper output token ($15/1M). Grok 4 has the larger context window (256k 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 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

xAI

Grok 4

Previous xAI flagship.

Elo 1,488$15/1M 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 4.6 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)vsGrok 4 (5)

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

← Claude Opus 4.5Grok 4 →

Claude Opus 4.5 (5/5)

Intelligence & Reasoning

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

Preference Elo

1,568vs1,488

Coding Elo

1,574vs—

SWE-bench

76.8%vs58.6%

LiveBench

71.2%vs64.1%

GPQA Diamond

84.1%vs79%

Claude Opus 4.5: 5WGrok 4: 0W

Grok 4 (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

62 tok/svs98 tok/s

Time to first token

380 msvs230 ms

Claude Opus 4.5: 0WGrok 4: 2W

Grok 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

200kvs256k

Claude Opus 4.5: 0WGrok 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

80 pts advantage

Throughput Speed

Grok 4

36 tok/s faster

Price Efficiency

Grok 4

$10.00/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

+5%1,568

EloHigh is better

1,488

Code Elo

High is better

1,574

Code EloHigh is better

—

LiveBench

High is better

+11%71.2%

LiveBenchHigh is better

64.1%

SWE-bench

High is better

+31%76.8%

SWE-benchHigh is better

58.6%

GPQA

High is better

+6%84.1%

GPQAHigh is better

79%

TTFT

Low is better

380 ms

TTFTLow is better

230 ms+65%

Speed

High is better

62 tok/s

SpeedHigh is better

98 tok/s+58%

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

256k+28%

Interactive Simulator

Workload Cost & Savings Calculator

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

Save up to 40% with Grok 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

Grok 4$330.00 / mo

In: $105.00Out: $225.00

Estimated Cost Delta

Grok 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
Grok 4:Pick Grok 4 when you are optimizing output cost.
3
Grok 4:Pick Grok 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 chatGrok 4

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

Voice / low-latency UIGrok 4

Lower TTFT (230 ms).

Long-document RAGGrok 4

Larger window (256k).

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	Grok 4	Lower output list price ($15/1M).
Voice / low-latency UI	Grok 4	Lower TTFT (230 ms).
Long-document RAG	Grok 4	Larger window (256k).
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.

launchJul 10, 2025

Grok 4 remains the previous xAI flagship on this catalog

2025-07 row. 4.6 is the buy. We keep 4 so upgrade pairs and old inbound links resolve.

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-opus-4-5-vs-grok-4/opengraph-image for crawlers.

PNG

CompareLLM Matrix

Verified head-to-head card

LIVE

Anthropic

Claude Opus 4.5

Elo 1,568

LiveBench71.2%

SWE-bench76.8%

Speed62 tok/s

Output cost$25/1M

xAI

Grok 4

Elo 1,488

LiveBench64.1%

SWE-bench58.6%

Speed98 tok/s

Output cost$15/1M

Frequently Asked Questions

Which is better overall, Claude Opus 4.5 or Grok 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 Grok 4?: Claude Opus 4.5 leads SWE-bench at 76.8% vs 58.6%. SWE-bench is one harness, not your repo.
Which is cheaper to run in production?: Grok 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 Grok 4?: Grok 4 has the lower time-to-first-token (230 ms vs 380 ms). Tokens/sec is a separate column if you care about long completions.
Which has the larger context window?: Grok 4 accepts 256k 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 Grok 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 Grok 4 matchups →

Claude Opus 4.5 vs Claude Opus 4 (previous opus)Claude Opus 4.5 vs Claude Opus 4.6 (next opus)Grok 4 vs Grok 3 (previous grok)Grok 4 vs Grok 4.6 (next grok)Claude Sonnet 5 vs Claude Opus 4.5 Grok 4.6 vs Claude Opus 4.5

Claude Opus 4.5 vs Grok 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)vsGrok 4 (5)

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

← Claude Opus 4.5Grok 4 →

Claude Opus 4.5 (5/5)

Intelligence & Reasoning

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

Preference Elo

1,568vs1,488

Coding Elo

1,574vs—

SWE-bench

76.8%vs58.6%

LiveBench

71.2%vs64.1%

GPQA Diamond

84.1%vs79%

Claude Opus 4.5: 5WGrok 4: 0W

Grok 4 (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

62 tok/svs98 tok/s

Time to first token

380 msvs230 ms

Claude Opus 4.5: 0WGrok 4: 2W

Grok 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

200kvs256k

Claude Opus 4.5: 0WGrok 4: 3W

Recommended Workload Routing

Repo / coding agentsClaude Opus 4.5

Higher SWE-bench (76.8%).

High-volume chatGrok 4

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

Voice / low-latency UIGrok 4

Lower TTFT (230 ms).

Long-document RAGGrok 4

Larger window (256k).

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	Grok 4	Lower output list price ($15/1M).
Voice / low-latency UI	Grok 4	Lower TTFT (230 ms).
Long-document RAG	Grok 4	Larger window (256k).
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 Grok 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 Grok 4?

Claude Opus 4.5 leads SWE-bench at 76.8% vs 58.6%. SWE-bench is one harness, not your repo.

Which is cheaper to run in production?

Grok 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 Grok 4?

Grok 4 has the lower time-to-first-token (230 ms vs 380 ms). Tokens/sec is a separate column if you care about long completions.

Which has the larger context window?

Grok 4 accepts 256k 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 Grok 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

Grok 4

Grok 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

Grok 4 remains the previous xAI flagship on this catalog

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

Claude Opus 4.5

Grok 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

Grok 4

Grok 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

Grok 4 remains the previous xAI flagship on this catalog

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

Claude Opus 4.5

Grok 4

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons