# Claude Sonnet 5: pricing, crowd verdict, pros and cons (2026)

> Anthropic's most agentic Sonnet: near Opus 4.8 quality on coding and agents at $3/$15 with 1M context

Source: [GLAD-AI-TOR](https://glad-ia-tor.com) · Full page: https://glad-ia-tor.com/tool/claude-sonnet-5
Arena: llm-models · Crowd score: 57% recommend (3 votes, Bayesian-smoothed) · Price: $15/1M out ($10 intro until 2026-08-31)

Anthropic's mid-tier model released June 30, 2026, succeeding Sonnet 4.6. Delivers performance close to Opus 4.8 on agentic coding, tool use and knowledge work at Sonnet pricing. 1M token context, 128K max output, adaptive thinking on by default.

## Key facts

- provider: Anthropic
- contextWindow: 1M tokens (128K max output)
- priceIn: $3/1M in ($2 intro until 2026-08-31)
- priceOut: $15/1M out ($10 intro until 2026-08-31)
- modalities: text, vision (image input, text output)
- openWeights: no

## Ratings (editorial, 1-5)

- reasoning: 4.5/5
- coding: 4.5/5
- writing: 4.5/5
- speed: 4/5
- valueForMoney: 4.5/5

## Pros

- Large agentic gains over Sonnet 4.6: Terminal-Bench 2.1 80.4% vs 67.0%, OSWorld-Verified 81.2% vs 78.5%, SWE-bench Pro 63.2% vs 58.1%
- Matches Opus 4.8 on knowledge work (GDPval-AA v2: 1,618 vs 1,615) and nearly ties it on Humanity's Last Exam with tools (57.4% vs 57.9%) at 60% of Opus 4.8 pricing (40% during the intro window)
- 1M token context window and 128K max output; introductory pricing of $2/$10 per 1M tokens through Aug 31, 2026
- Persistent self-verifying agent behavior: hands-on reviews note it tests its own code and iterates on hard problems until solved, unlike Sonnet 4.6
- First Sonnet with xhigh effort level and high-resolution vision (2576px images); adaptive thinking enabled by default
- Higher code-review precision than Sonnet 4.6 (38-40% vs 29%), producing fewer false-positive findings

## Cons

- New tokenizer inflates token counts roughly 30% for the same text (1.0-1.35x per Anthropic; ~1.4x English, ~1.28x Python measured by Simon Willison), raising effective cost despite the unchanged sticker price
- Verbose and token-hungry: ~$2.29 per task vs ~$1.20 for Sonnet 4.6 in independent tests (ranked 101st of 161 for cost efficiency); at high effort cost-per-task can exceed Opus 4.8
- Measurably slower than Sonnet 4.6 on small routine edits and prone to over-engineering simple tasks (CodeRabbit hands-on review)
- Sampling parameters (temperature, top_p, top_k) removed; non-default values return a 400 error, breaking existing pipelines
- Launch sentiment on HN/Reddit was mixed: the '5' label was seen as overpromising, and stricter cybersecurity safeguards can refuse benign security-adjacent work

## Best for

- coding agents
- computer-use and terminal agents
- long-context analysis
- cost-efficient knowledge work

## Verdict

Choose Sonnet 5 if you run coding, terminal or computer-use agents and want near Opus 4.8 quality at Sonnet prices, especially during the $2/$10 intro window; it is a strict upgrade over Sonnet 4.6 at low and medium effort. Budget for the new tokenizer and its verbosity: real per-task costs run well above Sonnet 4.6, and at the highest effort levels Opus 4.8 can be the better deal per solved task. Avoid it for latency-sensitive small edits or pipelines that rely on temperature and top_p, which now error. Sonnet 4.6 remains the pragmatic pick for high-volume tiny-diff workloads.

## Pricing note

Single tier: $3/$15 per 1M tokens standard, $2/$10 introductory through Aug 31, 2026; Batch API -50%; new tokenizer yields roughly 30% more tokens per text (1.0-1.35x per Anthropic), raising effective cost.

## Alternatives and head-to-heads

- [Claude Haiku 4.5](https://glad-ia-tor.com/tool/claude-haiku-4-5) (crowd score 67%) · [Claude Sonnet 5 vs Claude Haiku 4.5](https://glad-ia-tor.com/vs/claude-sonnet-5-vs-claude-haiku-4-5)
- [Claude Fable 5](https://glad-ia-tor.com/tool/claude-fable-5) (crowd score 63%) · [Claude Sonnet 5 vs Claude Fable 5](https://glad-ia-tor.com/vs/claude-sonnet-5-vs-claude-fable-5)
- [Claude Opus 4.7](https://glad-ia-tor.com/tool/claude-opus-4-7) (crowd score 57%) · [Claude Sonnet 5 vs Claude Opus 4.7](https://glad-ia-tor.com/vs/claude-sonnet-5-vs-claude-opus-4-7)
- [Gemini 3 Pro](https://glad-ia-tor.com/tool/gemini-3-pro) (crowd score 57%) · [Claude Sonnet 5 vs Gemini 3 Pro](https://glad-ia-tor.com/vs/claude-sonnet-5-vs-gemini-3-pro)

Full ranking: https://glad-ia-tor.com/hall-of-fame/llm-models

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