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BenchLM

Model comparison

Claude Opus 4.8 vs GPT-5 (high)

Data verified

Head-to-head evidence from 17 shared benchmark results across 6 categories. Overall scores shown here use BenchLM's provisional ranking lane.

85/100
Margin
13.0pts
← winning
72/100
0 category wins0 category wins

Verified leaderboard positions: Claude Opus 4.8 #3; GPT-5 (high) unranked

Evidence parity. Claude Opus 4.8 and GPT-5 (high) share 17 comparable benchmark results. 0 of 8 categories are comparable. 36 results are unique to Claude Opus 4.8; 4 to GPT-5 (high).

Updated July 12, 2026
Shared results
17
Claude Opus 4.8 only
36
GPT-5 (high) only
4
Comparable categories
0 / 8

Benchmark data for Claude Opus 4.8 and GPT-5 (high) is coming soon on BenchLM.

Confidence note. This is a partial-evidence comparison with 17 shared benchmark results across 6 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.

Claude Opus 4.8 is priced at $5.00 input / $25.00 output per 1M tokens, versus $1.25 input / $10.00 output per 1M tokens for GPT-5 (high). Claude Opus 4.8 has the larger context window at 1M, compared with 128K for GPT-5 (high).

Category breakdown

Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.

Category scores and score margins for Claude Opus 4.8 and GPT-5 (high)
CategoryClaude Opus 4.8ΔGPT-5 (high)
AgenticClaude Opus 4.880.3MarginNo overlapGPT-5 (high)Not measured
CodingClaude Opus 4.876.4MarginNo overlapGPT-5 (high)Not measured
KnowledgeClaude Opus 4.862.7MarginNo overlapGPT-5 (high)Not measured
MathClaude Opus 4.853.9MarginNo overlapGPT-5 (high)Not measured
MultimodalClaude Opus 4.877.0MarginNo overlapGPT-5 (high)Not measured

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricClaude Opus 4.8GPT-5 (high)Comparison
Input / output priceUSD per 1M tokensClaude Opus 4.8$5 input / $25 outputGPT-5 (high)$1.25 input / $10 outputGPT-5 (high) has the lower combined listed price.
Generation speedtokens per secondClaude Opus 4.8Not availableGPT-5 (high)83 tok/sA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Opus 4.8Not availableGPT-5 (high)36.28 sA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Opus 4.81MGPT-5 (high)128KClaude Opus 4.8 lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkClaude Opus 4.8GPT-5 (high)Result
Terminal-Bench 2.0Source 74.6%—Not comparable
BrowseCompSource 84.3%—Not comparable
DeepSearchQASource 93.1%—Not comparable
OSWorld-VerifiedSource 83.4%—Not comparable
Finance Agent v2Source 53.9%—Not comparable
GDPval-AASource 16001074Claude Opus 4.8 leads
MCP AtlasSource 82.2%—Not comparable
ToolathlonSource 59.9%—Not comparable
Gert LabsSource 72.97%—Not comparable
AA Agentic IndexSource 47.2%25.7%Claude Opus 4.8 leads
Tau2-TelecomSource 94.4%84.8%Claude Opus 4.8 leads
GDPval-AASource 55.0%28.7%Claude Opus 4.8 leads
ResearchClawBenchSource 21.1%—Not comparable
OSWorld 2.0Source 20.6%—Not comparable
AA BriefcaseSource 1354—Not comparable
AA AutomationBenchSource 48.5%—Not comparable
AA EnterpriseOps-GymSource 44.0%—Not comparable
AA Harvey LABSource 7.5%—Not comparable
AA Tau3 BankingSource 27.6%—Not comparable
JobBenchSource —8.5%Not comparable
Coding
BenchmarkClaude Opus 4.8GPT-5 (high)Result
SWE-bench VerifiedSource 88.6%—Not comparable
SWE-bench ProSource 69.2%—Not comparable
SWE MultilingualSource 84.4%—Not comparable
SWE MultimodalSource 38.4%—Not comparable
Terminal-Bench 2.0Source 74.6%—Not comparable
cursorBench31Source 58.4%—Not comparable
cursorBench32Source 62.3%—Not comparable
AA Coding IndexSource 74.3%37.8%Claude Opus 4.8 leads
Terminal-Bench HardSource 58.3%32.6%Claude Opus 4.8 leads
AA-SciCodeSource 53.5%42.9%Claude Opus 4.8 leads
FrontierCodeSource 46.5%—Not comparable
AA Terminal-Bench 2.1Source 84.6%—Not comparable
Vibe Code BenchSource —20.09%Not comparable
Reasoning
BenchmarkClaude Opus 4.8GPT-5 (high)Result
AA-LCRSource 67.7%75.6%GPT-5 (high) leads
CritPtSource 20.9%5.7%Claude Opus 4.8 leads
Knowledge
BenchmarkClaude Opus 4.8GPT-5 (high)Result
GPQASource 93.6%—Not comparable
GPQA-DSource 93.6%—Not comparable
HLESource 57.9%—Not comparable
HLE w/o toolsSource 49.8%—Not comparable
Artificial Analysis Intelligence IndexSource 55.7%34.7%Claude Opus 4.8 leads
AA-GPQA DiamondSource 92.0%85.4%Claude Opus 4.8 leads
AA-HLESource 45.7%26.5%Claude Opus 4.8 leads
AA-Omniscience IndexSource 27.4%-8.1%Claude Opus 4.8 leads
AA-Omniscience AccuracySource 46.6%40.7%Claude Opus 4.8 leads
AA-Omniscience Hallucination RateSource 35.9%82.1%Claude Opus 4.8 leads
Math
BenchmarkClaude Opus 4.8GPT-5 (high)Result
USAMO 2026Source 96.7%—Not comparable
FrontierMath v2 (Tiers 1-3)Source 47.241%—Not comparable
FrontierMath v2 (Tier 4)Source 31.250%—Not comparable
AA MATH-500Source —99.4%Not comparable
Multilingual
BenchmarkClaude Opus 4.8GPT-5 (high)Result
INCLUDESource 87.6%—Not comparable
Multimodal
BenchmarkClaude Opus 4.8GPT-5 (high)Result
OfficeQA ProSource 66.2%—Not comparable
ScreenSpot ProSource 87.9%—Not comparable
CharXivSource 89.9%—Not comparable
CharXiv w/o toolsSource 80.5%—Not comparable
Design Arena WebsiteSource 12811227Claude Opus 4.8 leads
AA-MMMU-ProSource —74.2%Not comparable
Inst. Following
BenchmarkClaude Opus 4.8GPT-5 (high)Result
AA-IFBenchSource 62.2%73.1%GPT-5 (high) leads
Frequently Asked Questions (3)

Can I compare Claude Opus 4.8 and GPT-5 (high) on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.

Why does this comparison show “coming soon”?

BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.

What data is available for Claude Opus 4.8 and GPT-5 (high) today?

Claude Opus 4.8: $5.00 input / $25.00 output per 1M tokens GPT-5 (high): $1.25 input / $10.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.

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Last updated: July 12, 2026

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