Which has a larger context window: GPT-5.5 or Claude Opus 4.8?

Both GPT-5.5 and Claude Opus 4.8 offer 1M token context windows. This makes them equally capable for processing very long documents, codebases, or extended conversations.

GPT-5.5 vs Claude Opus 4.8 — Premium AI Model Pricing 2026

Q: Is GPT-5.5 cheaper than Claude Opus 4.8?

GPT-5.5 costs $5/M input and $30/M output. Claude Opus 4.8 costs $5/M input and $25/M output. Input pricing is identical, but Claude Opus 4.8 is 17% cheaper on output tokens. For a typical premium workload of 1M input + 500K output tokens/month, GPT-5.5 costs $20 vs Claude Opus 4.8's $17.50 — saving you $2.50/month.

Requests per Day

Days per Month

OpenAI

GPT-5.5

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

Anthropic

Claude Opus 4.8

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

Other Premium-Tier Models

GPT-5.5 Pro

OpenAI

$30 / $180 per 1M

1M context

Claude Opus 4.7

Anthropic

$5 / $25 per 1M

1M context

GPT-5.5

OpenAI

$5 / $30 per 1M

1.05M context

Which Premium Model for Which Use Case?

Research & Analysis

Complex multi-step reasoning, literature review, data synthesis. Both models handle this well. Claude Opus 4.8's 17% output savings adds up at scale.

Better value: Claude Opus 4.8

Long Document Processing

Both have 1M context windows. For document-heavy workloads with large outputs, Claude Opus 4.8's lower output pricing gives it an edge.

Better value: Claude Opus 4.8

Complex Code Generation

Architectural decisions, multi-file refactoring, complex debugging. Both excel here. GPT-5.5 may have slight edge in certain coding benchmarks.

Benchmarks: GPT-5.5 | Value: Claude Opus 4.8

AI Agents & Autonomous Tasks

Multi-step autonomous workflows where the model reasons and acts. Output-heavy by nature — Claude Opus 4.8's cheaper output pricing makes a meaningful difference.

Better value: Claude Opus 4.8

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Frequently Asked Questions

Is GPT-5.5 cheaper than Claude Opus 4.8?

Input pricing is identical at $5/M tokens. Claude Opus 4.8 is 17% cheaper on output ($25/M vs $30/M). For output-heavy workloads, Claude Opus 4.8 is the better value.

Which has a larger context window?

Both GPT-5.5 and Claude Opus 4.8 offer 1M token context windows. They're equally capable for processing very long documents, codebases, or extended conversations.

When should I use GPT-5.5 Pro instead?

GPT-5.5 Pro costs $30/M input and $180/M output — 6x more expensive. Use it only for tasks requiring the absolute highest capability: complex multi-step reasoning, research analysis, or tasks where accuracy is critical. For most workloads, standard GPT-5.5 or Claude Opus 4.8 provide better value.

Are premium models worth the cost over mid-tier models?

It depends on your task complexity. For straightforward text generation, mid-tier models (GPT-5 at $1.25/$10, Claude Sonnet 4 at $3/$15) offer 3-5x better value. Premium models justify their cost for complex reasoning, long-context tasks, and nuanced analysis where quality directly impacts outcomes.