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Claude Opus 4.8 vs GPT-3.5 Turbo

The readout for Claude Opus 4.8 and GPT-3.5 Turbo, before the detailed comparison sheet.

Model A

Claude Opus 4.8

Anthropic

Leading
vs

Model B

GPT-3.5 Turbo

OpenAI

Contender

Key Takeaways

Weighted outcome: Claude Opus 4.8. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Decision read

Claude Opus 4.8

Claude Opus 4.8 has the higher weighted result; Model A / B score 96 to 4.

Evidence depth

73 data points

Includes 4 benchmark rows, 0 audit samples, and 10 provider examples.

Selection signal

Start with Claude Opus 4.8

The charts below split 14 high-signal samples across speed, scores, and audit health.

Change comparison

Switch either side of this report to compare another model with the same LMSpeed data pipeline.

Select a different model to open a new comparison URL.

Comparison sheet

This report only uses LMSpeed data for Claude Opus 4.8 and GPT-3.5 Turbo: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare
Claude Opus 4.8
GPT-3.5 Turbo
Overall leaderLeadingContender
Weighted overall score96.0 pts4.0 pts
Benchmark category leads3 categories0 categories
Operational advantagesCheapest input price, Average speed, Free providers, Provider coverageFirst-token latency
Context window1M tokens16.4K tokens
Max output128K tokens4.1K tokens
Modalities

Input

TextImageFile

Output

Text

Input

Text

Output

Text
Features
Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning
Text inputText outputTool callingStructured outputsJSON mode

The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.

Model metadata

Model compare
Claude Opus 4.8
GPT-3.5 Turbo
DeveloperAnthropicOpenAI
ReleasedMay 2026Jan 2024
ParametersNo dataNo data
TokenizerClaudeGPT
Knowledge cutoffNo data2021-09-30
OpenRouter IDanthropic/claude-opus-4.8openai/gpt-3.5-turbo
ReferencesNo dataNo data

When to choose each model

This report only uses LMSpeed data for Claude Opus 4.8 and GPT-3.5 Turbo: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Claude Opus 4.8

Claude Opus 4.8 is stronger in benchmark categories (Coding, Reasoning, Math) and operational dimensions (Cheapest input price, Average speed, Free providers, Provider coverage).

GPT-3.5 Turbo

GPT-3.5 Turbo has these operational advantages: First-token latency.

Benchmark score comparison

Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.

Category performance

Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.

Model A coverage
8 / 8
Model B coverage
3 / 8
Shared
3 shared categories

Avg. score

Claude Opus 4.8

58.1

Avg. score

GPT-3.5 Turbo

38.9

Agents

Claude Opus 4.8

Claude Opus 4.861.8
GPT-3.5 Turbo-

Coding

Claude Opus 4.8 leads by 18.4

Claude Opus 4.864
GPT-3.5 Turbo45.6

Reasoning

Claude Opus 4.8 leads by 22.6

Claude Opus 4.855.9
GPT-3.5 Turbo33.3

Knowledge

Claude Opus 4.8

Claude Opus 4.862.1
GPT-3.5 Turbo-

Math

Claude Opus 4.8 leads by 19.4

Claude Opus 4.857.2
GPT-3.5 Turbo37.8

Multilingual

Claude Opus 4.8

Claude Opus 4.855
GPT-3.5 Turbo-

Multimodal

Claude Opus 4.8

Claude Opus 4.859
GPT-3.5 Turbo-

Instruction following

Claude Opus 4.8

Claude Opus 4.850
GPT-3.5 Turbo-

Professional benchmark details

Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.

Pricingverified

Output price

SourceClaude Opus 4.8 (Adaptive Reasoning, Max Effort)

Claude Opus 4.8

$25.00/M

Rank #169/186 · confidence 4

+$23.50/M

GPT-3.5 Turbo

winner

$1.50/M

Rank #65/186 · confidence 4

Pricingverified

Blended price

SourceClaude Opus 4.8 (Adaptive Reasoning, Max Effort)

Claude Opus 4.8

$10.00/M

Rank #169/186 · confidence 4

+$9.25/M

GPT-3.5 Turbo

winner

$0.750/M

Rank #73/186 · confidence 4

Pricingverified

Input price

SourceClaude Opus 4.8 (Adaptive Reasoning, Max Effort)

Claude Opus 4.8

$5.00/M

Rank #168/186 · confidence 4

+$4.50/M

GPT-3.5 Turbo

winner

$0.500/M

Rank #85/186 · confidence 4

Reasoningverified

GPQA

SourceClaude Opus 4.8 (Adaptive Reasoning, Max Effort)

Claude Opus 4.8

winner

92.0%

Rank #19/218 · confidence 4

+62.3%

GPT-3.5 Turbo

29.7%

Rank #217/218 · confidence 4

API audit comparison

Latest completed audits from shared providers, with four safety and integrity score groups plus report links.

Provider
Claude Opus 4.8
GPT-3.5 Turbo
No completed audits are available from shared providers yet.

Provider examples

Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.

Provider
Claude Opus 4.8
GPT-3.5 Turbo
Jasper10 tests

Claude Opus 4.8

speed / latency

89 tok/s / 3213ms

input / output

No data

GPT-3.5 Turbo

speed / latency

N/A / N/A

input / output

No data

BUZZ5 tests

Claude Opus 4.8

speed / latency

50 tok/s / 4823ms

input / output

No data

GPT-3.5 Turbo

speed / latency

N/A / N/A

input / output

No data

EasyMore5 tests

Claude Opus 4.8

speed / latency

N/A / N/A

input / output

No data

GPT-3.5 Turbo

speed / latency

54 tok/s / 9591ms

input / output

No data

42公益站0 tests

Claude Opus 4.8

speed / latency

N/A / N/A

input / output

No data

GPT-3.5 Turbo

speed / latency

N/A / N/A

input / output

No data

9527 API0 tests

Claude Opus 4.8

speed / latency

N/A / N/A

input / output

No data

GPT-3.5 Turbo

speed / latency

N/A / N/A

input / output

No data

兔子API

Claude Opus 4.8

claude-opus-4-8

speed / latency

No data

input / output

$0/request

GPT-3.5 Turbo

gpt-3.5-turbo-16k

speed / latency

No data

input / output

$0/request

KFCV50

Claude Opus 4.8

claude-opus-4-8

speed / latency

No data

input / output

$0.017/request

GPT-3.5 Turbo

gpt-3.5-turbo-0125

speed / latency

No data

input / output

$0.034/M/$0.103/M

ZEN-AI VIP

Claude Opus 4.8

claude-opus-4-8

speed / latency

No data

input / output

$1.03/M/$5.14/M

GPT-3.5 Turbo

gpt-3.5-turbo

speed / latency

No data

input / output

$0.021/M/$0.062/M

PoloAPI

Claude Opus 4.8

claude-opus-4-8-c

speed / latency

No data

input / output

$0.027/request

GPT-3.5 Turbo

gpt-3.5-turbo

speed / latency

No data

input / output

$0.055/M/$0.164/M

Jeniya AI API

Claude Opus 4.8

claude-opus-4-8

speed / latency

No data

input / output

$0.131/M/$0.654/M

GPT-3.5 Turbo

gpt-3.5-turbo-1106

speed / latency

No data

input / output

$0.031/M/$0.061/M

FAQ

Weighted outcome: Claude Opus 4.8. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Why is this comparison indexable?
It has 6 verifiable comparison points, and both models have pricing or benchmark data.
Are missing metrics invented?
No. Metrics without LMSpeed data are omitted from this report.

Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.