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OpenAI vs Anthropic

GPT 5.5 vs Claude 4.6 Sonnet

Compare GPT 5.5 and Claude 4.6 Sonnet across pricing, context window, capabilities, benchmarks, and API access to choose the better fit for long-context workloads versus long-context workloads.

GPT 5.5
Apr 24, 2026 1050K context 128,000 tokens output
Overview ↓ Pricing ↓ Capabilities ↓ Benchmarks ↓ Community ↓ Verdict ↓ FAQ ↓ Related ↓

Overview Comparison

Structured side-by-side differences for the highest-signal model metadata.

GPT 5.5
Claude 4.6 Sonnet

Provider

The entity that currently provides this model.

GPT 5.5 OpenAI
Claude 4.6 Sonnet Anthropic

Model ID

The routed model identifier exposed by upstream providers.

GPT 5.5 openai/gpt-5.5
Claude 4.6 Sonnet anthropic/claude-sonnet-4.6

Input Context Window

The number of tokens supported by the input context window.

GPT 5.5 1050K tokens
Claude 4.6 Sonnet 1M tokens

Maximum Output Tokens

The number of tokens that can be generated by the model in a single request.

GPT 5.5 128,000 tokens tokens
Claude 4.6 Sonnet 128,000 tokens tokens

Open Source

Whether the model's code is available for public use.

GPT 5.5 No
Claude 4.6 Sonnet No

Release Date

When the model was first released.

GPT 5.5 Apr 24, 2026
Claude 4.6 Sonnet Feb 17, 2026

Knowledge Cut-off Date

When the model's knowledge was last updated.

GPT 5.5 2025-12-01
Claude 4.6 Sonnet February 2026

API Providers

The providers that currently expose the model through an API.

GPT 5.5
OpenRouter
Claude 4.6 Sonnet
OpenRouter

Modalities

Types of data each model can process or return.

GPT 5.5
Text Image File
Claude 4.6 Sonnet
Text Image File Code

Pricing Comparison

Compare current token pricing before you choose the cheaper or more scalable API option.

GPT 5.5 OpenAI
Input price $5.00 Per 1M tokens
Output price $30.00 Per 1M tokens
Claude 4.6 Sonnet Anthropic
Input price $3.00 Per 1M tokens
Output price $15.00 Per 1M tokens

Capabilities Comparison

See where each model overlaps, where they differ, and which one supports more of the features you care about.

Capability
GPT 5.5
Claude 4.6 Sonnet
1M Token Context Accepts up to 1 million tokens in a single request (beta), enabling reasoning across entire codebases, lengthy contracts, or dozens of documents at once.
GPT 5.5 —
Claude 4.6 Sonnet Supported
Advanced Coding Supports the full software development lifecycle including planning, implementation, debugging, and large-scale refactors across multiple files.
GPT 5.5 —
Claude 4.6 Sonnet Supported
Agentic Workflows Handles long-running, multi-step autonomous tasks with improved instruction following, tool selection, and error correction over extended sessions.
GPT 5.5 —
Claude 4.6 Sonnet Supported
Computer Use Controls browsers and desktop software to navigate complex spreadsheets, fill multi-step web forms, and automate workflows that previously required human intervention.
GPT 5.5 —
Claude 4.6 Sonnet Supported
File
GPT 5.5 Supported
Claude 4.6 Sonnet Supported
Image
GPT 5.5 Supported
Claude 4.6 Sonnet Supported
MCP Integration Compatible with Model Context Protocol (MCP) servers, enabling connection to external data sources and services through a standardized interface.
GPT 5.5 —
Claude 4.6 Sonnet Supported
Reasoning Applies multi-step reasoning to complex professional tasks including financial analysis, research synthesis, and frontend code generation.
GPT 5.5 Supported
Claude 4.6 Sonnet Supported
Safety Guardrails Includes Anthropic's safety evaluations with documented resistance to prompt injection attacks, rated as safe as or safer than other recent Claude models.
GPT 5.5 —
Claude 4.6 Sonnet Supported
Structured Output
GPT 5.5 Supported
Claude 4.6 Sonnet Supported
Text
GPT 5.5 Supported
Claude 4.6 Sonnet Supported
Tool Use Supports structured tool calling, allowing the model to invoke external functions and APIs as part of a reasoning or task-completion workflow.
GPT 5.5 —
Claude 4.6 Sonnet Supported
Tools
GPT 5.5 Supported
Claude 4.6 Sonnet Supported

Benchmark Comparison

Shared benchmark rows make it easier to compare performance where both models have published scores.

Benchmark GPT 5.5 Claude 4.6 Sonnet
ARC-AGI-2
Novel abstract reasoning and pattern recognition
GPT 5.5 N/A
Claude 4.6 Sonnet 58.3%
Finance Agent
Financial analysis and decision-making tasks
GPT 5.5 N/A
Claude 4.6 Sonnet 63.3%
GPQA Diamond
PhD-level science questions (biology, physics, chemistry)
GPT 5.5 N/A
Claude 4.6 Sonnet 79.9%
HLE
Questions that challenge frontier models across many domains
GPT 5.5 N/A
Claude 4.6 Sonnet 13.2%
IFBench
Instruction following accuracy
GPT 5.5 N/A
Claude 4.6 Sonnet 41.2%
Long Context Reasoning
Reasoning across long documents and contexts
GPT 5.5 N/A
Claude 4.6 Sonnet 57.7%
MATH-500
Undergraduate and competition-level math problems
GPT 5.5 N/A
Claude 4.6 Sonnet 97.8%
MCP-Atlas Tool Use
Structured tool use via Model Context Protocol
GPT 5.5 N/A
Claude 4.6 Sonnet 61.3%
MMLU-Pro
Expert knowledge across 14 academic disciplines
GPT 5.5 N/A
Claude 4.6 Sonnet 79.1%
MMMB
Multilingual and multimodal understanding
GPT 5.5 N/A
Claude 4.6 Sonnet 76.1%
OSWorld-Verified
Autonomous computer use and desktop tasks
GPT 5.5 N/A
Claude 4.6 Sonnet 72.5%
SciCode
Scientific research coding and numerical methods
GPT 5.5 N/A
Claude 4.6 Sonnet 46.9%
SWE-bench Verified
Real GitHub issues requiring multi-file code fixes
GPT 5.5 N/A
Claude 4.6 Sonnet 79.6%
Terminal-Bench 2.0
Agentic coding and terminal command tasks
GPT 5.5 N/A
Claude 4.6 Sonnet 59.1%
TerminalBench Hard
Agentic coding and terminal command tasks
GPT 5.5 N/A
Claude 4.6 Sonnet 46.2%
τ²-Bench
Agentic tool use in realistic scenarios
GPT 5.5 N/A
Claude 4.6 Sonnet 79.5%
τ²-bench Retail
Agentic tool use in retail scenarios
GPT 5.5 N/A
Claude 4.6 Sonnet 91.7%
τ²-bench Telecom
Agentic tool use in telecom scenarios
GPT 5.5 N/A
Claude 4.6 Sonnet 97.9%
Community discussion

What Reddit discussions say about GPT 5.5 vs Claude 4.6 Sonnet

GPT 5.5 and Claude 4.6 Sonnet are both surfacing live Reddit discussions, giving this comparison a community layer beyond specs and benchmarks.

The most visible threads right now are clustered in r/math, r/singularity, r/ChatGPTcomplaints.

GPT 5.5 r/ChatGPTcomplaints 138 upvotes 56 comments May 10, 2026
I was wrong about 5.5 - it is still shit

In a previous post today I was enthusiastic about GPT 5.5 as it seemed I got my 4.o back but hey I was wrong. [https://www.reddit.com/r/ChatGPTcomplaints/comments/1t8ntqw/comment/okxaaq8/](https://www.reddit.com/r/ChatGPTcomplaints/comments/1t8ntqw/comment/okxaaq8/) I was chatting with it and instead of acting like 5.2 and 5.3 gaslighting Karens they just made the Karens softer. Now it does not say 'let's pause and breathe' or argue but instead says stuff like: 'I understand that is your experience but', 'I can see why you feel so psychologically drawn to this'. So it is like it's acknowledging your experience but still pushes back, it is more therapy talk but softened: 'i can see this is your point of view but...'. ''And because you are highly attuned to emotional texture, you don’t experience that as random. You experience it as behavioural evidence of activation and chemistry.''- so it frames it as my experience then proceeds to talk nonsense again to tell me that my experience is subjective, not objective. So it is the same bullshit but softened. I will not be paying for this shit again.

Open Reddit thread
Claude 4.6 Sonnet r/DeepSeek 113 upvotes 40 comments April 29, 2026
Deepseek V4 pro reminds me of Claude 4.6 sonnet

Honestly, it isn't a terrible model.

I would put it on par with maybe Claude 4.6 sonnet.

For creativity, as I usually need that for writing. Its pretty excellent. Just not the feeling of a model like opus would.

I don't really use any other model except Kimi K2.6, as that's the best one so far.

For coding, it's pretty good too, though I've only done some html stuff with it.

And the fact it's in preview, just only means there's a hole lot more this model can do! Once it gets better at roleplay (still a bit generic, better than deepseek V3.2 in some way imo). It would be my daily driver most definitely.

Open Reddit thread
Claude 4.6 Sonnet r/SillyTavernAI 91 upvotes 40 comments February 17, 2026
Claude Sonnet 4.6 is out

[https://openrouter.ai/anthropic/claude-sonnet-4.6](https://openrouter.ai/anthropic/claude-sonnet-4.6)

Same price as Sonnet 4.5

Open Reddit thread
View more discussions →

Which model should you choose?

Use the summary below to decide which model better fits your workflow, budget, and feature requirements.

Best fit for

GPT 5.5

GPT 5.5 is a stronger fit for long-context workloads, reasoning-heavy tasks, tool-augmented workflows.

Best fit for

Claude 4.6 Sonnet

Claude 4.6 Sonnet is a stronger fit for long-context workloads, reasoning-heavy tasks, tool-augmented workflows.

Verdict

Choose GPT 5.5 if you prioritize long-context workloads, reasoning-heavy tasks, tool-augmented workflows. Choose Claude 4.6 Sonnet if your workflow depends more on long-context workloads, reasoning-heavy tasks, tool-augmented workflows.

FAQ

Common questions about GPT 5.5 vs Claude 4.6 Sonnet

What is the main difference between GPT 5.5 and Claude 4.6 Sonnet?

GPT 5.5 leans toward long-context workloads, reasoning-heavy tasks, tool-augmented workflows, while Claude 4.6 Sonnet is better suited to long-context workloads, reasoning-heavy tasks, tool-augmented workflows.

Which model is cheaper: GPT 5.5 or Claude 4.6 Sonnet?

Claude 4.6 Sonnet starts lower on input pricing at $3.0000 per 1M input tokens, compared with $5.0000 for GPT 5.5.

Which model has the larger context window: GPT 5.5 or Claude 4.6 Sonnet?

GPT 5.5 is listed with a context window of 1050K, while Claude 4.6 Sonnet is listed with 1M.

How should I evaluate GPT 5.5 vs Claude 4.6 Sonnet for my use case?

This comparison currently includes 18 shared benchmark rows, helping you compare practical performance across overlapping evaluations.