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Claude Sonnet 5 in Offloop

Choose Claude Sonnet 5 for your agents in Offloop.

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Agents

Model
Research agent
Code reviewer
Project assistant

What work is Sonnet 5 suited for?

Sonnet 5 API · $2 input / $10 output per million tokensSonnet 5 API · $2 input / $10 output per million tokens
Task 1 of 3

Watch a Sonnet 5 test

Pat Simmons compares Sonnet 5 with Opus 4.8 and Sonnet 4.6. The video starts at 4:19 with a portfolio site build; his coding verdict favors Opus 4.8.

Independent test · Pat Simmons · June 30, 2026 · 22:52 video

Watch on YouTube

Published evaluations

Results published with the Claude Sonnet 5 launch.

Published June 30, 2026

Choose an evaluation

SWE-bench Pro

Resolving issues in software repositories.

Higher is better · Chart range: 0–100%

SWE-bench Pro — all models in the source comparison
ModelScore
Claude Sonnet 5
63.2%
Claude Sonnet 4.6
58.1%
Claude Opus 4.8
69.2%

Anthropic reports Sonnet 5 at max effort with adaptive thinking, default sampling and an average of five trials. These are benchmark issue-resolution results, not a code-review accuracy measure.

Anthropic launch post
Methodology and all scores

SWE-bench Pro

Anthropic reports Sonnet 5 at max effort with adaptive thinking, default sampling and an average of five trials. These are benchmark issue-resolution results, not a code-review accuracy measure.

  • Claude Sonnet 5: 63.2%
  • Claude Sonnet 4.6: 58.1%
  • Claude Opus 4.8: 69.2%

GDPval-AA v2

Artificial Analysis ran 220 tasks spanning 44 occupations. Snapshot: June 17, 2026. Sonnet 5 and Opus 4.8 are statistically tied. Elo is a relative rating, not a success percentage.

  • Claude Sonnet 5: 1618 Elo
  • Claude Sonnet 4.6: 1395 Elo
  • Claude Opus 4.8: 1615 Elo

From the community

What people say about Claude Sonnet 5.

Pietro Schirano

@skirano

Working through longer tasks

“It’s a surprisingly sharp model, especially on long-horizon tasks.”

Personal experience with Sonnet 5.

MagicPath CEO · Formerly Anthropic

July 1, 2026

Gurbaksh Chahal

@gurbakshchahal

Choosing where to spend

For his tasks, Chahal questions whether Sonnet 5’s higher price is worth it. He describes cheaper models that work well for him.

Our summary of his post; no controlled comparison.

Founder of AuraOne · Model cost discussion

August 11, 2026

davosjet

u/davosjet

Daily development

“It feels like a great daily driver on medium and high, noticeably less token hungry than Opus for 80% of tasks.”

iOS and macOS development; 80% is the author’s estimate.

r/ClaudeCode

holyknight00

u/holyknight00

When complexity costs more

“The only problem is that for more complex stuff it consumes more tokens and is way slower to get there than opus, but the line is hard to draw.”

Finds Sonnet viable when work is properly scoped.

r/ClaudeCode

FabricationLife

u/FabricationLife

Code review with clear context

“sonnet works totally well if you use small context and are very explicit, I use it for code reviews which most people claim it sucks at, I assure you it works just fine”

Code review with a small context and explicit instructions.

r/ClaudeCode

abnormal_human

u/abnormal_human

Parallel work, less waiting

“So it may burn more tokens, but it does it, in my experience, in less wall time, and gets similar results.”

Comparing routine development with Opus; uses parallel subagents.

r/ClaudeCode

jomi-se

u/jomi-se

A higher bill

“Feels expensive tbh. Spent $30 on something that is made with $5 the day before.”

A personal cost report; the earlier model is not specified.

r/ClaudeCode

FreshPine_MangoWine

u/FreshPine_MangoWine

Formulaic writing

“My biggest problem with 5 is that’s for me it’s been prone to speak more AI like and use common AI phrases.”

Discussing creative writing and character dialogue.

r/WritingWithAI

Frosin

u/Frosin

Editing and formatting

“Use it as editor and it work good for saving your time on formatting and general spell check”

Recommends editing in a mixed discussion of creative writing.

r/WritingWithAI

Posts discuss the models in the authors’ own setups, not Offloop.

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