Sonnet 4.5 still matters for marathon coding, but October’s story is Haiku 5.5: verified $0.10/$0.50 API pricing for shorter prompts and clearer roles for small-model subagents. Pair them instead of forcing one model to do everything.
AI Agents · Tool review
Claude Sonnet 4.5 & Haiku 5.5: Pricing and What’s New (2026)
TechPilot.ai review team Hands-on testing, one published method - Last updated
- How we test
Summary
Pros and cons
What we like
- Long-session coding Sonnet 4.5 was built for extended autonomous development work.
- Cheap volume model Haiku 5.5 undercuts prior Haiku pricing for prompts under 100K tokens.
- Wide availability Haiku 5.5 is on Claude.ai and major clouds.
- Agent mix Use Sonnet to plan and Haiku to execute subtasks.
What could be better
- Model churn Sonnet 4.5 is no longer Anthropic’s headline mid model.
- Prompt-length cliff Haiku 5.5 jumps to $0.50/$2.50 above 100K tokens.
- Plan limits still apply Free and Pro hit rolling usage caps.
- Legacy API rates Confirm Sonnet 4.5 meter in Console before budgeting.
Key features
- High Benchmark Performance: Achieves high scores on difficult coding and computer use benchmarks like SWE-bench Verified and OSWorld.
- Extended Autonomous Operation: A key feature allowing the model to work on complex computational tasks for more than 30 hours.
- Agentic Capabilities: Good performance in tool handling, memory management, and context processing for building complex agents.
- Claude Code Checkpoints: Allows developers to save and roll back the AI’s progress, providing a safety net during complex coding sessions.
- Native VS Code Extension: Brings the ai coding assistant‘s capabilities directly into the popular code editor.
- Claude Agent SDK: Gives developers access to the same infrastructure Anthropic uses to build its own AI agents.
- Direct Code Execution: The model can execute code snippets to verify its work or perform calculations within the conversation.
- File Creation: Claude Sonnet 4.5 can create and populate files like spreadsheets, presentations, and documents.
- Improved Alignment: Built-in safety protocols are included to minimize harmful or unhelpful outputs.
- Refreshed Terminal Interface: An updated and more direct user interface within the Claude Code environment.
Screenshots
Full review
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Claude Sonnet 4.5 is Anthropic’s long-running coding agent model. Haiku 5.5 launched Oct 7 at $0.10/$0.50 per 1M tokens. See verified Oct 2026 pricing.
Claude Sonnet 4.5 is Anthropic’s mid-size coding and agent model launched September 29, 2025, known for long autonomous sessions. In October 2026 the Claude lineup moved again: Claude Haiku 5.5 launched on October 7, 2026 as the cheap, fast small model, and Anthropic cut Sonnet 5.5 cache-read prices the same day. This page keeps Sonnet 4.5 in context and adds the verified Haiku 5.5 / plan numbers.
What’s new (Oct 2026)
Updated October 13, 2026. Anthropic’s Haiku 5.5 launch post prices the model by prompt length: for prompts up to 100K tokens, $0.10 per million input and $0.50 per million output; over 100K tokens, $0.50 / $2.50. Cache reads are listed at $0.01 / $0.05 depending on the prompt tier. The same post says Sonnet 5.5 cache reads dropped to $0.10 per million (from $0.20), about 20% cheaper on many agentic workloads.
Where you can use it. Anthropic’s Haiku product page says Free, Pro, Max, Team and Enterprise users can select Haiku 5.5 on Claude.ai (web, iOS, Android), and developers call claude-haiku-5-5 on the Claude Platform plus AWS, Google Cloud and Microsoft Foundry. Max and Team subscribers also get new monthly API credits (Max 5x $100, Max 20x $200, Team up to $500 pooled), per the Oct 7 post.
Our take: keep Sonnet 4.5 / Sonnet 5.5 for multi-hour coding agents; route high-volume summaries, classifiers and subagents to Haiku 5.5. The $0.10/$0.50 tier only applies under 100K prompt tokens—long contexts jump to $0.50/$2.50. For other TechPilot.ai model pages, see FLUX 3, Grok Bot and Jev AI.
Claude Sonnet 4.5 Pricing (2026)
Consumer Claude plans on claude.com/pricing (checked October 13, 2026) and API figures from Anthropic’s Haiku 5.5 materials:
| Offer | Price | What it covers |
|---|---|---|
| Claude Free | $0 | Chat on web/desktop/mobile with limits |
| Claude Pro | $17/mo annual ($200 upfront) or $20 monthly | More usage, Claude Code, projects, more models |
| Claude Max | From $100/mo | 5x or 20x Pro usage, higher output limits |
| Haiku 5.5 API (≤100K prompt) | $0.10 in / $0.50 out per 1M tokens | From anthropic.com/claude-haiku-5-5 |
| Haiku 5.5 API (>100K prompt) | $0.50 in / $2.50 out per 1M tokens | Same Anthropic launch page |
Sonnet 4.5 API list rates are no longer the headline on Anthropic’s current pricing cards (the page we opened listed newer Claude 5-family models). If you still call Sonnet 4.5, confirm the live rate in the Anthropic Console rather than relying on 2025 screenshots.
Best use cases
- Long coding agents: Sonnet-class models for refactors and multi-hour repos.
- High-volume subagents: Haiku 5.5 for summaries, routing, compaction and parallel tool calls.
- Real-time assistants: Haiku 5.5 when latency matters more than frontier reasoning.
- Mixed stacks: Sonnet plans work; Haiku subagents execute.
Claude Sonnet 4.5 FAQ
What is Claude Sonnet 4.5?
Claude Sonnet 4.5 is Anthropic’s September 2025 mid-size model aimed at long autonomous coding and complex agent work.
•
What is Claude Haiku 5.5?
Haiku 5.5 launched October 7, 2026 as Anthropic’s fastest, cheapest small model for high-volume and low-latency tasks, with API id claude-haiku-5-5.
•
How much does Claude Haiku 5.5 cost?
On the Claude Platform, $0.10/$0.50 per million input/output tokens for prompts up to 100K tokens, and $0.50/$2.50 above 100K, per Anthropic’s launch page.
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How much is Claude Pro?
As of October 13, 2026, Pro is $17 a month with annual prepay ($200) or $20 billed monthly on claude.com/pricing.
•
Is Haiku 5.5 free on Claude.ai?
Anthropic says Free, Pro, Max, Team and Enterprise users can select Haiku 5.5 on Claude.ai; Free still has usage limits.
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