Claude Sonnet 5.5 vs GPT Chat Latest
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 Chat Latest points to OpenAI's stable API alias chat-latest that always resolves to the latest Instant chat model used in ChatGPT.
- Reasoning estimated
- Speed estimated
- Input
- Output
- Context
- 400 K tokens
- Max output
- 128 K
- Input, $ per 1M tokens
- $5.00
- Output, $ per 1M tokens
- $30.00
- Cache read, $ per 1M
- $0.500
- Batch (input / output)
- —
- Tool calling
- Yes
- Released
- 05/05/2026
- Knowledge cutoff
- 2025-12-01
- API id
- openai/gpt-chat-latest
Which is the better API choice: Claude Sonnet 5.5 vs GPT Chat Latest?
- Claude Sonnet 5.5: cheapest input (60% less than GPT Chat Latest)
- Claude Sonnet 5.5: cheapest output
- Claude Sonnet 5.5: largest context (1 M)
- Claude Sonnet 5.5: the newest (09/28/2026)
Claude Sonnet 5.5 costs 60% less on input and 67% less on output than GPT Chat Latest ($2.00 / $10.00 versus $5.00 / $30.00 per million tokens). Claude Sonnet 5.5 accepts more context (1 M). Claude Sonnet 5.5 offers 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 $125.00 a month versus GPT Chat Latest (64% 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
- 4GPT Chat Latest OpenAI$0.380
- 5Claude Opus 5 Anthropic$0.380
- 6Claude Opus 4.8 Anthropic$0.380
- 7Claude Fable 5.1 Anthropic$0.760
- 8Claude Fable 5 Anthropic$0.760
Popular comparisons
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- GPT-6.1 Sol vs Gemini 3.8 Flash
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- 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
- DeepSeek V4.1 Flash vs Grok 4.7
Frequently asked questions
Which is the better API choice: Claude Sonnet 5.5 vs GPT Chat Latest?
Claude Sonnet 5.5 costs 60% less on input and 67% less on output than GPT Chat Latest ($2.00 / $10.00 versus $5.00 / $30.00 per million tokens). Claude Sonnet 5.5 accepts more context (1 M). Claude Sonnet 5.5 offers a batch tier at half price for jobs that do not need an immediate answer.
Which is cheaper: Claude Sonnet 5.5 and GPT Chat Latest?
Claude Sonnet 5.5 is cheaper: $2.00 per million input tokens and $10.00 per million output tokens, versus $5.00 / $30.00 for GPT Chat Latest.
Which has more context: Claude Sonnet 5.5 and GPT Chat Latest?
Claude Sonnet 5.5 accepts 1 M tokens of context; GPT Chat Latest accepts 400 K.
Which is newer: Claude Sonnet 5.5 and GPT Chat Latest?
Claude Sonnet 5.5 was released on 09/28/2026; GPT Chat Latest on 05/05/2026.
What would 10,000 requests a month cost with Claude Sonnet 5.5 and GPT Chat Latest?
With 1,500 input and 400 output tokens per request: Claude Sonnet 5.5: $70.00; GPT Chat Latest: $195.00 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.