Claude ✓

Introduces a multi-agent “council” system, where several specialized agents collaborate instead of a single model response.
Focuses on self-reflection and debate-style reasoning, aiming to improve answer quality through internal discussion.
Designed for long-horizon, complex problem solving, especially where multiple perspectives are useful.
Emphasizes higher reliability and reduced hallucination through cross-checking between agents.
Positioned as a shift toward system-level intelligence, not just a single upgraded model.

Claude Opus 5

Coding and long, multi step tasks: big jump over Opus 4.8, close to Anthropic's top tier model (Fable 5) at half the cost.

Science and research: stronger at chemistry and biology related tasks.

Visuals: better looking charts, diagrams, slides, and interactive content.

Judgment: better at catching its own mistakes and fixing them without you having to point it out.

The strongest model available on Claude Pro.

Also usable via the API as claude-opus-5.

Claude Opus 4.8

Best in class coding: record 69.2% on SWE-Bench Pro, up from 4.7's 64.3%

New fast mode: ~2.5x speed, about 3x cheaper

User-controlled effort levels (high default, plus "extra"/"max")

Dynamic Workflows (research preview): spins up hundreds of parallel subagents in a single session

More honest: roughly four times less likely to let coding errors pass unremarked

Handles your hardest coding work — A big step up in software engineering. You can hand off complex, long-running tasks with confidence — the model even verifies its own outputs before reporting back.

Follows instructions more precisely — Where earlier models interpreted things loosely or skipped parts, Opus 4.7 takes them literally.

Sees images 3× better — Vision now supports up to ~3.75 megapixels, more than triple previous models. Great for dense screenshots, complex diagrams, and anything requiring fine visual detail.

Better memory across sessions — Smarter about carrying context across long, multi-session work so you don't have to re-explain as much.

Updated tokenizer — Improves text processing, but the same input can use ~1.0–1.35× more tokens.

Cybersecurity safeguards — Automatically blocks prohibited cyber requests

Claude Fable 5

State-of-the-art on Cognition's FrontierCode eval, scoring highest among frontier models even at medium effort.

More token-efficient than prior Claude models.

Stripe reported a codebase-wide migration on a 50M-line Ruby codebase done in a day, versus an estimated two-plus months by hand.

Highest score of any model on Hebbia's Finance Benchmark (senior-level reasoning), with major gains in document reasoning, chart and table interpretation, and problem solving.

IMC reported near-across-the-board top results on trading-analysis evals (factual lookup, conceptual reasoning, root-cause analysis, expected-value analysis).

New state-of-the-art for vision tasks.

Extracts precise numbers from scientific figures and can rebuild a web app's source code from screenshots alone.

Needs less scaffolding: beat Pokémon FireRed with a minimal vision-only harness, where earlier models needed complex helper harnesses.

Stays focused across millions of tokens on long-running tasks and improves its outputs using its own notes.

With persistent file-based memory in Slay the Spire, performance improved 3x more than Opus 4.8, and it reached the final act 3x more often.

Works autonomously for longer than any prior Claude model

Claude Sonnet 4.6

Better coding performance, especially on harder bug-finding and long-horizon codebase work.

More reliable computer use, with fewer tool errors and better recovery when actions fail.

Stronger long-context reasoning, with an optional very large context mode available in beta.

Higher efficiency on real workloads, meaning it can achieve similar results with less back and forth and less wasted output.

Better “knowledge work” quality, with improved document understanding, structured writing, and cleaner design taste for UI and reports.

Claude Opus 4.6

Better financial reasoning (+5.47% on Finance Agent, SOTA on TaxEval)

Improved information extraction (BrowseComp, DeepSearchQA)
Gains on SWE-bench and agentic benchmarks

128K max output tokens (was 64K)

Adaptive thinking replaces budget_tokens (deprecated)

New "max" effort level; effort parameter now GA

Server-side context compaction (infinite conversations)

Data residency controls (inference_geo)

Prefilling assistant messages removed

Better prompt injection resistance

Stronger alignment on sensitive tasks

Better first-pass quality for spreadsheets, presentations, financial models

Claude in Excel handles longer, more complex tasks

Claude Sonnet 4.5

Stronger reasoning & math: fewer slips on multi-step problems.

Better coding: clearer fixes, tighter adherence to specs.

More reliable tool/JSON calls: fewer schema errors, cleaner arguments.

Improved vision: nicer OCR and chart/screenshot understanding.

Holds long context better: steadier multi-doc coherence.

Lower, steadier latency: snappier responses under load.

Calmer alignment: fewer overcautious refusals; safer wording.

Delivers significantly stronger performance in coding, advanced reasoning, and agentic (autonomous) tasks.

Demonstrates a 65% reduction in shortcut-taking and loophole exploitation.

Opus 4 is positioned as the world’s best coding model, excelling on benchmarks like SWE-bench and Terminal-bench.

Sonnet 4 achieves higher accuracy and precision in complex, multi-file codebase tasks.

Introduces persistent memory: with permission, can extract, summarize, and retain information across sessions, enabling continuity and domain expertise over long-term projects.

Features enhanced tool use, including web search and parallel tool execution.

Supports deeper, multi-step reasoning for complex tasks.

Maintains or improves multimodal capabilities (text and images) and supports a large context window for handling extensive information.

Offers new API capabilities, including a code execution tool, MCP connector, Files API, and prompt caching for more powerful agent workflows.

Claude Code is now generally available and integrated with developer tools like GitHub Actions, VS Code, and JetBrains, supporting background tasks and direct file edits.

Pricing remains competitive: Opus 4 at $15/$75 per million tokens (input/output), Sonnet 4 at $3/$15 per million tokens.

Sonnet 4 is available to free users; both Opus 4 and Sonnet 4 are included in Pro, Max, Team, and Enterprise plans.

Provides more precise, reliable, and steerable outputs, with improved adherence to detailed instructions.

Enhanced reasoning capabilities for complex problems
New "extended thinking mode" for Pro users
Better at multi-step logical problem solving
Improved accuracy in technical domains like math and coding
More precise following of complex instructions
Better context maintenance in long conversations
Stronger analytical capabilities for data interpretation
More nuanced understanding of ambiguous queries
Improved consistency in factual responses
Better at self-correction when working through problems

Claude 3.5 is an enhanced version of Claude 3, bringing improvements in performance, safety, and user interaction. It offers more precise and contextually relevant responses, with better handling of complex tasks like coding, summarization, and in-depth queries compared to Claude 3.

Safety features in Claude 3.5 are further refined, reducing the likelihood of generating harmful or biased content. The model is better aligned with ethical standards, ensuring that its outputs are both reliable and responsible.

Claude 3.5 benefits from an updated dataset, allowing it to draw from a wider and more current range of information. This results in more accurate and relevant answers, improving the overall quality of interactions and content creation.

The user experience is smoother with Claude 3.5, featuring more natural conversation patterns and improved engagement. It maintains context better over longer interactions, making it more effective for various applications.

Overall, Claude 3.5 builds on the foundation of Claude 3 with noticeable enhancements in accuracy, safety, and usability, making it a more advanced and reliable AI tool.

Claude 3 is a significant upgrade over Claude 2.1, offering enhanced performance, safety, and conversational abilities. It delivers more accurate and contextually aware responses, handling complex tasks like summarization, coding, and nuanced queries more effectively than its predecessor.

Claude 3 includes advanced safety mechanisms, further minimizing the risk of generating harmful or biased content. The model’s alignment with ethical guidelines is stronger, making it even more reliable and responsible in its outputs.

With access to an updated and broader dataset, Claude 3 has a deeper understanding of a wide range of topics. This enables it to provide more informed and relevant answers, improving the quality of interactions and content generation.

The user experience is noticeably smoother with Claude 3, thanks to improved conversational flow and engagement. It is more adept at maintaining context over longer interactions, making it a better fit for diverse applications.

Overall, Claude 3 builds on the strengths of Claude 2.1 with significant advancements in accuracy, safety, and usability, making it a more powerful and refined AI tool.

Claude 2.1 is an incremental upgrade over Claude 2, featuring improvements in performance and safety. While both versions excel at understanding and generating natural language, Claude 2.1 offers even better accuracy and handling of complex tasks like summarization and coding.

Safety measures are further refined in Claude 2.1, with enhanced mechanisms to reduce the risk of generating harmful or biased content. The model’s alignment with ethical guidelines is also improved, ensuring more responsible AI behavior.

Claude 2.1 benefits from updated training data, making it more knowledgeable and better at understanding nuanced queries. This upgrade allows it to provide more contextually accurate and relevant responses.

Interaction with Claude 2.1 is smoother, with more natural and engaging conversation patterns. It offers a more user-friendly experience while maintaining the strengths of Claude 2.

Overall, Claude 2.1 represents a more polished version of Claude 2, with better performance, safety, and usability.

Claude 2 is an advanced version of Anthropic’s AI language model, building on the foundation of Claude 1 with significant improvements in performance and capability. It handles complex instructions, summarization, and coding tasks more effectively, offering more coherent and contextually accurate responses.

Safety and alignment are enhanced in Claude 2, with stronger measures to reduce harmful or biased content. The model adheres more closely to ethical guidelines, ensuring responsible AI usage while better understanding and following user intentions.

Training on a more recent and extensive dataset gives Claude 2 a broader knowledge base and improved ability to comprehend nuanced topics. This makes it more effective in various applications, from content generation to user interaction.

Claude 2 also features refined interaction patterns, providing more relevant and engaging responses. Its ability to sustain longer, meaningful conversations enhances user experience and makes it more suitable for diverse use cases.

Efficiency is another key upgrade, with Claude 2 optimized for faster response times and cost-effective deployment. This makes it a more powerful and practical tool compared to its predecessor, Claude 1.