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Model comparison

Claude Fable 5 vs GPT-OSS 120B

Data verified

Head-to-head evidence from 17 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

83.68/100
Margin
33.6pts
← winning
50.08/100
0 category wins0 category wins

Public leaderboard positions: Claude Fable 5 #2 (Supported); GPT-OSS 120B #116 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude Fable 5 and GPT-OSS 120B share 17 comparable benchmark results. 0 of 8 categories are comparable. 17 results are unique to Claude Fable 5; 9 to GPT-OSS 120B.

Updated July 23, 2026
Shared results
17
Claude Fable 5 only
17
GPT-OSS 120B only
9
Comparable categories
0 / 8

Benchmark data for Claude Fable 5 and GPT-OSS 120B 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 Fable 5 is priced at $10.00 input / $50.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for GPT-OSS 120B. Claude Fable 5 has the larger context window at 1M+, compared with 128K for GPT-OSS 120B.

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 Fable 5 and GPT-OSS 120B
CategoryClaude Fable 5ΔGPT-OSS 120B
AgenticClaude Fable 584.6MarginNo overlapGPT-OSS 120BNot measured
CodingClaude Fable 589.2MarginNo overlapGPT-OSS 120BNot measured
MultimodalClaude Fable 557.9MarginNo overlapGPT-OSS 120BNot measured

Operational comparison

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

MetricClaude Fable 5GPT-OSS 120BComparison
Input / output priceUSD per 1M tokensClaude Fable 5$10 input / $50 outputGPT-OSS 120B$0 input / $0 outputGPT-OSS 120B has the lower combined listed price.
Generation speedtokens per secondClaude Fable 5Not availableGPT-OSS 120B262 tok/sA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Fable 5Not availableGPT-OSS 120B0.79 sA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Fable 51M+GPT-OSS 120B128KClaude Fable 5 lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkClaude Fable 5GPT-OSS 120BResult
Terminal-Bench 2.0Source 84.3%—Not comparable
OSWorld-VerifiedSource 85%—Not comparable
GDPval-AASource 1748799Claude Fable 5 leads
AA Agentic IndexSource 52.8%13.2%Claude Fable 5 leads
τ²-bench resultsSource 98.5%65.8%Claude Fable 5 leads
GDPval-AASource 62.4%15.0%Claude Fable 5 leads
AA BriefcaseSource 1574—Not comparable
AA AutomationBenchSource 48.6%—Not comparable
AA EnterpriseOps-GymSource 51.1%25.5%Claude Fable 5 leads
AA Harvey LABSource 93.6%—Not comparable
AA Tau3 BankingSource 26.8%—Not comparable
terminalBenchHardSource 62.9%—Not comparable
aaTerminalBench21Source 84.6%—Not comparable
APEX-Agents-AASource —3.1%Not comparable
Gert LabsSource —29.61%Not comparable
AA ITBenchSource —5.6%Not comparable
Coding
BenchmarkClaude Fable 5GPT-OSS 120BResult
SWE-bench VerifiedSource 95%—Not comparable
SWE-bench ProSource 80%—Not comparable
FrontierCode 1.1 MainSource 53.5%—Not comparable
Terminal-Bench 2.0Source 84.3%—Not comparable
cursorBench31Source 70.6%—Not comparable
cursorBench32Source 70.5%—Not comparable
VulcanBench v3Source 87.0%—Not comparable
AA Coding IndexSource 76.5%30.4%Claude Fable 5 leads
AA-SciCodeSource 60.2%38.9%Claude Fable 5 leads
React Native EvalsSource —71.6%Not comparable
AA LiveCodeBenchSource —87.8%Not comparable
Reasoning
BenchmarkClaude Fable 5GPT-OSS 120BResult
AA-LCRSource 70.0%50.7%Claude Fable 5 leads
CritPtSource 28.6%1.1%Claude Fable 5 leads
Knowledge
BenchmarkClaude Fable 5GPT-OSS 120BResult
Artificial Analysis Intelligence IndexSource 59.9%23.8%Claude Fable 5 leads
AA-GPQA DiamondSource 92.6%78.2%Claude Fable 5 leads
AA-HLESource 53.3%18.5%Claude Fable 5 leads
AA-Omniscience IndexSource 40.2%-50.0%Claude Fable 5 leads
AA-Omniscience AccuracySource 61.4%21.5%Claude Fable 5 leads
AA-Omniscience Hallucination RateSource 54.9%91.2%Claude Fable 5 leads
AA Openness IndexSource —38.9%Not comparable
AA MMLU-ProSource —80.8%Not comparable
Math
BenchmarkClaude Fable 5GPT-OSS 120BResult
AA AIME 2025Source —93.4%Not comparable
Multilingual
BenchmarkClaude Fable 5GPT-OSS 120BResult
AA Global-MMLU-LiteSource —82.8%Not comparable
Multimodal
BenchmarkClaude Fable 5GPT-OSS 120BResult
Blueprint-Bench 2Source 38.6%—Not comparable
OfficeQA ProSource 57.9%—Not comparable
Design Arena WebsiteSource 1332998Claude Fable 5 leads
Inst. Following
BenchmarkClaude Fable 5GPT-OSS 120BResult
AA-IFBenchSource 63.5%69.0%GPT-OSS 120B leads
Frequently Asked Questions (3)

Can I compare Claude Fable 5 and GPT-OSS 120B 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 Fable 5 and GPT-OSS 120B today?

Claude Fable 5: $10.00 input / $50.00 output per 1M tokens GPT-OSS 120B: $0.00 input / $0.00 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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