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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsDoes Claude Code resend the whole conversation every time you send a message, and are you charged for it again? Anthropic’s documentation does not establish that the entire raw session is retransmitted and billed at the standard uncached input rate on every turn. Claude Code can continue or resume conversations, while API prompt caching can reuse matching prompt prefixes. Context continuity and billing are related, but they are not the same thing.
What happens to session context and what gets billed?
Claude Code maintains continuity across turns and supports continuing or resuming conversations. Its CLI reference also documents a default system-prompt snapshot behavior that reuses a recorded prompt where applicable. Those behaviors do not prove that every historical message is sent again in the same form, or that every token is billed as fresh, uncached input. Anthropic’s documentation describes prompt caching as reuse of matching prompt prefixes. Anthropic’s CLI reference and prompt-caching documentation explain these mechanisms; neither supports the claim that every turn incurs a full-session charge at the ordinary input rate.
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For API use, charges depend on token consumption and the applicable model rates. For Claude Pro and Max, Claude Code usage is included in the subscription; a session cost estimate is not a per-turn API bill. Check the billing model you actually use before interpreting a dollar figure. Anthropic’s Claude Code cost guide
How prompt caching changes API costs
Anthropic describes prompt caching as a way to reuse a matching prompt prefix up to a cache breakpoint. When a match is available, the cached prefix is reused; if it is not, the system processes the prompt and caches the prefix as the response begins. Automatic caching moves the breakpoint as a multi-turn conversation grows, while explicit breakpoints allow finer control. This changes how matching input is processed and priced; it does not demonstrate that contextual content is absent from a request.
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- The documented default cache lifetime is five minutes.
- An optional one-hour cache lifetime is available at additional cost.
- Input, cache-write, and cache-hit rates are distinct and vary by model. There is no single savings percentage that applies to every Claude Code workload.
To estimate the effect for your use, compare the active model’s current rates with your own cache-write and cache-hit mix, and account for how quickly requests recur within the cache lifetime. See Anthropic’s current pricing documentation alongside its prompt-caching guide.
How to tell whether caching is helping
- Open Claude Code’s
/usagedisplay. For API use, inspect the prompt-cache summary to see the request count, share of input tokens served from cache, misses, and whether the cache is warm. Anthropic says this prompt-cache line requires Claude Code v2.1.251 or later. The guide’s sample of “14 requests · 91% of input tokens from cache” is an interface illustration, not a typical result or a guaranteed outcome. - Check the active model and your request pattern. Cache-write and cache-hit rates depend on the model, and reuse depends on matching prefixes and request timing. Workloads with different codebase sizes, multiple instances, or automation can have different usage patterns.
- Confirm API charges in the Claude Console. The in-session dollar figure is an estimate based on token counts and list prices unless configured model pricing applies. Anthropic says, “The figure is an estimate, so for authoritative billing see the Usage page in the Claude Console.” The Console Usage page is the authoritative reference for API billing. Pro and Max users should use their plan usage information instead of treating the session estimate as an API invoice. Anthropic’s cost guide
What costs can you expect?
Anthropic’s current Claude Code cost documentation reports an enterprise deployment average of around $13 per developer per active day and $150–250 per developer per month; it also says costs are below $30 per active day for 90% of users. These are vendor-published estimates for enterprise deployments, accessed in 2026—not a forecast for an individual or a claim that the page was published in 2026. Anthropic notes that costs vary widely with the model, codebase, and usage. Measure a representative pilot group rather than projecting the enterprise figures onto every developer. Anthropic’s Claude Code cost guide
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Which cost controls should you compare?
- API users: compare the active model’s ordinary input, output, cache-write, and cache-hit rates; your cached-input share and misses; request timing and cache lifetime; and workload factors such as codebase size and concurrent instances.
- Pro and Max users: track plan usage and your observed workload. A session cost estimate is not a direct API charge for a subscription.
Anthropic’s documentation provides the mechanisms and usage indicators, but it does not establish one universal savings rate for Claude Code. Your own cache statistics and billing records are the practical evidence for whether caching is reducing your API costs.
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