Claude Sonnet 5.5 vs GPT-5 Pro
Pick up to 3 models · pricing, context and capabilities · simulate your product cost
Data updated on September 30, 2026· 217 models
Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade.
- Reasoning estimated
- Speed estimated
- ▲
- Input
- Output
- Context
- ▲1 M tokens
- Max output
- 128 K
- Input, $ per 1M tokens
- ▲$2.00
- Output, $ per 1M tokens
- ▲$10.00
- Cache read, $ per 1M
- $0.200
- Batch (input / output)
- $1.00 / $5.00
- Tool calling
- Yes
- Released
- ▲09/28/2026
- Knowledge cutoff
- 2026-06
- API id
- anthropic/claude-sonnet-5.5
GPT-5 Pro is OpenAI’s most advanced model, offering major improvements in reasoning, code quality, and user experience.
- Reasoning estimated
- ▲
- Speed estimated
- Input
- Output
- Context
- 400 K tokens
- Max output
- 128 K
- Input, $ per 1M tokens
- $15.00
- Output, $ per 1M tokens
- $120.00
- Cache read, $ per 1M
- —
- Batch (input / output)
- $7.50 / $60.00
- Tool calling
- Yes
- Released
- 10/06/2025
- Knowledge cutoff
- 2024-09-30
- API id
- openai/gpt-5-pro
Which is the better API choice: Claude Sonnet 5.5 vs GPT-5 Pro?
- Claude Sonnet 5.5: cheapest input (87% less than GPT-5 Pro)
- Claude Sonnet 5.5: cheapest output
- Claude Sonnet 5.5: largest context (1 M)
- Claude Sonnet 5.5: the newest (09/28/2026)
- GPT-5 Pro: most reasoning (estimated)
- Claude Sonnet 5.5: the fastest (estimated)
Claude Sonnet 5.5 costs 87% less on input and 92% less on output than GPT-5 Pro ($2.00 / $10.00 versus $15.00 / $120.00 per million tokens). Claude Sonnet 5.5 accepts more context (1 M). Claude Sonnet 5.5 and GPT-5 Pro offer a batch tier at half price for jobs that do not need an immediate answer.
What would your product cost?
Estimate the monthly cost with your app's real volume. List prices, no cache or batch discounts.
With Claude Sonnet 5.5 you save $635.00 a month versus GPT-5 Pro (90% less).
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Paste your prompt: tokens and cost per model
Rough estimate (about 4 characters per token). Nothing is sent to any server.
Cost of sending it 1,000 times (input only)
- 1Claude Sonnet 5.5 Anthropic$0.152
- 2Claude Sonnet 5 Anthropic$0.152
- 3Claude Opus 5.5 Anthropic$0.304
- 4Claude Opus 5 Anthropic$0.380
- 5Claude Opus 4.8 Anthropic$0.380
- 6Claude Fable 5.1 Anthropic$0.760
- 7Claude Fable 5 Anthropic$0.760
- 8GPT-5 Pro OpenAI$1.14
Popular comparisons
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- GPT-6.1 Sol vs Gemini 3.8 Flash
- GPT-6.1 Sol vs DeepSeek V4.1 Flash
- GPT-6.1 Sol vs Grok 4.7
- Gemini 3.8 Flash vs DeepSeek V4.1 Flash
- Gemini 3.8 Flash vs Grok 4.7
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Frequently asked questions
Which is the better API choice: Claude Sonnet 5.5 vs GPT-5 Pro?
Claude Sonnet 5.5 costs 87% less on input and 92% less on output than GPT-5 Pro ($2.00 / $10.00 versus $15.00 / $120.00 per million tokens). Claude Sonnet 5.5 accepts more context (1 M). Claude Sonnet 5.5 and GPT-5 Pro offer a batch tier at half price for jobs that do not need an immediate answer.
Which is cheaper: Claude Sonnet 5.5 and GPT-5 Pro?
Claude Sonnet 5.5 is cheaper: $2.00 per million input tokens and $10.00 per million output tokens, versus $15.00 / $120.00 for GPT-5 Pro.
Which has more context: Claude Sonnet 5.5 and GPT-5 Pro?
Claude Sonnet 5.5 accepts 1 M tokens of context; GPT-5 Pro accepts 400 K.
Which is newer: Claude Sonnet 5.5 and GPT-5 Pro?
Claude Sonnet 5.5 was released on 09/28/2026; GPT-5 Pro on 10/06/2025.
What would 10,000 requests a month cost with Claude Sonnet 5.5 and GPT-5 Pro?
With 1,500 input and 400 output tokens per request: Claude Sonnet 5.5: $70.00; GPT-5 Pro: $705.00 a month, at list price.
Where do the prices come from and how often are they updated?
From the public catalogs of OpenRouter, models.dev and LiteLLM, which publish each provider's list prices. They sync once a day and the last update date is shown above the comparison.
What does price per million tokens mean?
It is what the provider charges per million tokens you send (input) or the model generates (output). A token is roughly 4 characters. Output almost always costs more than input.
Sources: OpenRouter, models.dev and LiteLLM. Prices in USD per million tokens, list price, no volume discounts. Prompt tokens are an estimate; each provider's tokenizer may differ.