Pairwise benchmark snapshot · Aug 17, 2026noindex (thin pair)

Claude 3.7 Sonnet vs OpenAI: gpt-oss-20b (free) benchmark

Name: Claude 3.7 Sonnet vs OpenAI: gpt-oss-20b (free) AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

This page compares Claude 3.7 Sonnet (Anthropic) and OpenAI: gpt-oss-20b (free) (OpenAI) using the latest snapshots we have as of Aug 17, 2026. OpenAI: gpt-oss-20b (free) wins on output price at $0/1M. Claude 3.7 Sonnet has the larger context window (200k 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 3.7 Sonnet

Hybrid-reasoning Sonnet from 2025. Kept for historical compare pages.

Elo 1,362$15/1M out

OpenAI

OpenAI: gpt-oss-20b (free)

Auto-discovered from OpenRouter (openai/gpt-oss-20b:free). Preview until a second source matches.

$0/1M out

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

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Claude 3.7 Sonnet (7)vsOpenAI: gpt-oss-20b (free) (2)

Claude 3.7 Sonnet: 7W (78%)Overall: Claude 3.7 SonnetOpenAI: gpt-oss-20b (free): 2W (22%)

← Claude 3.7 SonnetOpenAI: gpt-oss-20b (free) →

Claude 3.7 Sonnet (4/5)

Intelligence & Reasoning

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

Preference Elo

1,362vs—

Coding Elo

—vs—

SWE-bench

70.3%vs—

LiveBench

58.4%vs—

GPQA Diamond

78.5%vs—

Claude 3.7 Sonnet: 4WOpenAI: gpt-oss-20b (free): 0W

Claude 3.7 Sonnet (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

85 tok/svs—

Time to first token

240 msvs—

Claude 3.7 Sonnet: 2WOpenAI: gpt-oss-20b (free): 0W

OpenAI: gpt-oss-20b (free) (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$15/1Mvs$0/1M

Input price

$3/1Mvs$0/1M

Context window

200kvs131k

Claude 3.7 Sonnet: 1WOpenAI: gpt-oss-20b (free): 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 3.7 Sonnet 5/6

Preference Elo

No shared data

Throughput Speed

No shared data

Price Efficiency

OpenAI: gpt-oss-20b (free)

$15.00/1M cheaper

Full Benchmark Score Matrix

—

Elo

High is better

1,362

EloHigh is better

—

LiveBench

High is better

58.4%

LiveBenchHigh is better

—

SWE-bench

High is better

70.3%

SWE-benchHigh is better

—

GPQA

High is better

78.5%

GPQAHigh is better

—

TTFT

Low is better

240 ms

TTFTLow is better

—

Speed

High is better

85 tok/s

SpeedHigh is better

—

In $

Low is better

$3/1M

In $Low is better

$0/1M

Out $

Low is better

$15/1M

Out $Low is better

$0/1M

Context

High is better

+53%200k

ContextHigh is better

131k

Key Selection Recommendations

1
OpenAI: gpt-oss-20b (free):Pick OpenAI: gpt-oss-20b (free) when you are optimizing output cost.

Recommended Workload Routing

Repo / coding agentsinsufficient data

Need SWE-bench on both sides.

High-volume chatOpenAI: gpt-oss-20b (free)

Lower output list price ($0/1M).

Voice / low-latency UIinsufficient data

Need TTFT on both sides.

Long-document RAGClaude 3.7 Sonnet

Larger window (200k).

Screenshots / visionClaude 3.7 Sonnet

Claude 3.7 Sonnet is the side marked multimodal in the catalog.

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	insufficient data	Need SWE-bench on both sides.
High-volume chat	OpenAI: gpt-oss-20b (free)	Lower output list price ($0/1M).
Voice / low-latency UI	insufficient data	Need TTFT on both sides.
Long-document RAG	Claude 3.7 Sonnet	Larger window (200k).
Screenshots / vision	Claude 3.7 Sonnet	Claude 3.7 Sonnet is the side marked multimodal in the catalog.

Related Editorial Dispatches & Benchmark Notes

View all news

newsFeb 25, 2025

Claude 3.7 Sonnet stays as a historical hybrid-reasoning baseline

2025 hybrid-reasoning Sonnet. Deprecated for buying, kept for old compare URLs and “what did 3.7 score?”

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LIVE

Anthropic

Claude 3.7 Sonnet

Elo 1,362

LiveBench58.4%

SWE-bench70.3%

Speed85 tok/s

Output cost$15/1M

OpenAI

OpenAI: gpt-oss-20b (free)

Elo n/a

LiveBench—

SWE-bench—

Speed—

Output cost$0/1M

Frequently Asked Questions

Which is better overall, Claude 3.7 Sonnet or OpenAI: gpt-oss-20b (free)?: We do not have preference Elo for both models, so we do not declare an overall winner. Compare the metrics that exist.
Which is better at coding, Claude 3.7 Sonnet or OpenAI: gpt-oss-20b (free)?: SWE-bench is missing for at least one model, so we do not rank coding from a single number.
Which is cheaper to run in production?: OpenAI: gpt-oss-20b (free) output tokens are $0/1M versus $15/1M. Input prices and retry rates still move the real bill.
Which is faster, Claude 3.7 Sonnet or OpenAI: gpt-oss-20b (free)?: We do not have TTFT for both models.
Which has the larger context window?: Claude 3.7 Sonnet accepts 200k tokens versus 131k.
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 3.7 Sonnet and OpenAI: gpt-oss-20b (free) Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Similar Head-to-Head Comparisons

All Claude 3.7 Sonnet matchups →|All OpenAI: gpt-oss-20b (free) matchups →

Claude 3.7 Sonnet vs Claude 3.5 Sonnet (previous sonnet)Claude 3.7 Sonnet vs Claude Sonnet 4 (next sonnet)Claude Opus 4.5 vs Claude 3.7 Sonnet Claude Opus 4.6 vs Claude 3.7 Sonnet Claude Sonnet 4.5 vs Claude 3.7 Sonnet GPT-5 vs Claude 3.7 Sonnet

Claude 3.7 Sonnet vs OpenAI: gpt-oss-20b (free) benchmark

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

Claude 3.7 Sonnet (7)vsOpenAI: gpt-oss-20b (free) (2)

Claude 3.7 Sonnet: 7W (78%)Overall: Claude 3.7 SonnetOpenAI: gpt-oss-20b (free): 2W (22%)

← Claude 3.7 SonnetOpenAI: gpt-oss-20b (free) →

Claude 3.7 Sonnet (4/5)

Intelligence & Reasoning

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

Preference Elo

1,362vs—

Coding Elo

—vs—

SWE-bench

70.3%vs—

LiveBench

58.4%vs—

GPQA Diamond

78.5%vs—

Claude 3.7 Sonnet: 4WOpenAI: gpt-oss-20b (free): 0W

Claude 3.7 Sonnet (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed

85 tok/svs—

Time to first token

240 msvs—

Claude 3.7 Sonnet: 2WOpenAI: gpt-oss-20b (free): 0W

OpenAI: gpt-oss-20b (free) (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price

$15/1Mvs$0/1M

Input price

$3/1Mvs$0/1M

Context window

200kvs131k

Claude 3.7 Sonnet: 1WOpenAI: gpt-oss-20b (free): 2W

Recommended Workload Routing

Repo / coding agentsinsufficient data

Need SWE-bench on both sides.

High-volume chatOpenAI: gpt-oss-20b (free)

Lower output list price ($0/1M).

Voice / low-latency UIinsufficient data

Need TTFT on both sides.

Long-document RAGClaude 3.7 Sonnet

Larger window (200k).

Screenshots / visionClaude 3.7 Sonnet

Claude 3.7 Sonnet is the side marked multimodal in the catalog.

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	insufficient data	Need SWE-bench on both sides.
High-volume chat	OpenAI: gpt-oss-20b (free)	Lower output list price ($0/1M).
Voice / low-latency UI	insufficient data	Need TTFT on both sides.
Long-document RAG	Claude 3.7 Sonnet	Larger window (200k).
Screenshots / vision	Claude 3.7 Sonnet	Claude 3.7 Sonnet is the side marked multimodal in the catalog.

Frequently Asked Questions

Which is better overall, Claude 3.7 Sonnet or OpenAI: gpt-oss-20b (free)?

We do not have preference Elo for both models, so we do not declare an overall winner. Compare the metrics that exist.

Which is better at coding, Claude 3.7 Sonnet or OpenAI: gpt-oss-20b (free)?

SWE-bench is missing for at least one model, so we do not rank coding from a single number.

Which is cheaper to run in production?

OpenAI: gpt-oss-20b (free) output tokens are $0/1M versus $15/1M. Input prices and retry rates still move the real bill.

Which is faster, Claude 3.7 Sonnet or OpenAI: gpt-oss-20b (free)?

We do not have TTFT for both models.

Which has the larger context window?

Claude 3.7 Sonnet accepts 200k tokens versus 131k.

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 3.7 Sonnet and OpenAI: gpt-oss-20b (free) 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

No shared data

No shared data

OpenAI: gpt-oss-20b (free)

Full Benchmark Score Matrix

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Claude 3.7 Sonnet stays as a historical hybrid-reasoning baseline

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

Claude 3.7 Sonnet

OpenAI: gpt-oss-20b (free)

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

No shared data

No shared data

OpenAI: gpt-oss-20b (free)

Full Benchmark Score Matrix

Key Selection Recommendations

Recommended Workload Routing

Related Editorial Dispatches & Benchmark Notes

Claude 3.7 Sonnet stays as a historical hybrid-reasoning baseline

Cast Your Matchup Vote

Community Discussions (0)

Share card

CompareLLM Matrix

Claude 3.7 Sonnet

OpenAI: gpt-oss-20b (free)

Frequently Asked Questions

Related news

Similar Head-to-Head Comparisons