Claude Sonnet 4.6 vs GPT-5.4
Anthropic against OpenAI, costed on the same three workloads. GPT-5.4 is cheaper on all three workloads.
Run this comparison on your own numbers
Monthly bill, side by side
| Workload | Claude Sonnet 4.6 | GPT-5.4 | Difference |
|---|---|---|---|
| Support chatbot 2,500 six-turn conversations a day |
$12,083 | $11,081 | $1,001 (+9%) |
| Document summarizer 1,000 single-shot summaries a day |
$1,458 | $1,275 | $183 (+14%) |
| Coding agent 200 twelve-turn sessions a day |
$8,424 | $7,470 | $954 (+13%) |
No prompt caching and no batch discount on either side, so the comparison is like for like. Both figures assume 30 days a month.
The rate cards
| Claude Sonnet 4.6 | GPT-5.4 | |
|---|---|---|
| Input, per 1M tokens | $3 | $2.5 |
| Output, per 1M tokens | $15 | $15 |
| Cached input | $0.3 | $0.25 |
| Context window | 1M | 1.05M |
| Maximum output | 128K | 128K |
| Reasoning model | yes | yes |
| Vision | yes | yes |
Beyond the price
- GPT-5.4 reads up to 1.05M tokens of context in one request; Claude Sonnet 4.6 stops at 1M.
- Only GPT-5.4 offers a batch discount — 50% off both rates for work that can wait.
Run this comparison on your own numbers
Full detail: Claude Sonnet 4.6 pricing · GPT-5.4 pricing
More comparisons
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Common questions
Which is cheaper, Claude Sonnet 4.6 or GPT-5.4?
GPT-5.4 is cheaper on all three workloads.
How much would Claude Sonnet 4.6 and GPT-5.4 cost each month?
On PromptSpend's standard workloads, per month: support chatbot: Claude Sonnet 4.6 $12,083, GPT-5.4 $11,081 (GPT-5.4 is cheaper by $1,001); document summarizer: Claude Sonnet 4.6 $1,458, GPT-5.4 $1,275 (GPT-5.4 is cheaper by $183); coding agent: Claude Sonnet 4.6 $8,424, GPT-5.4 $7,470 (GPT-5.4 is cheaper by $954). No prompt caching and no batch discount is assumed.
How do Claude Sonnet 4.6 and GPT-5.4 differ apart from price?
GPT-5.4 reads up to 1.05M tokens of context in one request; Claude Sonnet 4.6 stops at 1M. Only GPT-5.4 offers a batch discount — 50% off both rates for work that can wait.