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Reading the price history.
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Reading the price history.
USD per 1M tokens. Tracked: our read of the official page on 8 Oct 2026. MPW: the current Model Price Watch listing.
AgreeOur read of the official page on 8 Oct 2026 matches MPW on input, output and cached input.
| Price | Tracked | MPW | Difference | Agreement |
|---|---|---|---|---|
| Input | 2.00 | 2.00 | 0.00 (0.0%) | Agree |
| Output | 10.00 | 10.00 | 0.00 (0.0%) | Agree |
| Cached input | 0.10 | 0.10 | 0.00 (0.0%) | Agree |
| BlendedDerived | 4.00 | 4.00 | 0.00 (0.0%) | Agree |
USD per 1M tokens, to 8 Oct 2026. A price holds until it changes; the tracked line breaks on days without a read.
Left and Right arrow keys move between price changes. Shift with an arrow key moves one day. Home and End jump to the ends. Escape hides the details.
Left and Right arrow keys move between covered runs and points. Up and Down switch rows. Escape hides the details.
Tracker: 1 of 1 day observed (100%) · MPW: 10 records since 29 Sep 2026 · Mismatch: 0 days
Left and Right arrow keys move between price changes. Shift with an arrow key moves one day. Home and End jump to the ends. Escape hides the details.
Left and Right arrow keys move between covered runs and points. Up and Down switch rows. Escape hides the details.
Tracker: 1 of 1 day observed (100%) · MPW: 10 records since 29 Sep 2026 · Mismatch: 0 days
Left and Right arrow keys move between price changes. Shift with an arrow key moves one day. Home and End jump to the ends. Escape hides the details.
Left and Right arrow keys move between covered runs and points. Up and Down switch rows. Escape hides the details.
Tracker: 1 of 1 day observed (100%) · MPW: 10 records since 29 Sep 2026 · Mismatch: 0 days
Left and Right arrow keys move between price changes. Shift with an arrow key moves one day. Home and End jump to the ends. Escape hides the details.
Left and Right arrow keys move between covered runs and points. Up and Down switch rows. Escape hides the details.
Tracker: 1 of 1 day observed (100%) · MPW: 10 records since 29 Sep 2026 · Mismatch: 0 days
Moves between two known prices, newest first, from both histories. A price that only appears or disappears is a coverage change, not a move.
| Date | Source | Change | Prices, $/1M | Blended, $/1M | Blended change |
|---|---|---|---|---|---|
| MPW | Cut |
| 4.00 to 4.00 | 0% |
How many days each history observed this model, and where it has gaps.
| Measure | MPWModel Price Watch | TrackedOur tracker |
|---|---|---|
| Data points | 10 | 1 |
| First observed | ||
| Last observed | ||
| Observed days | 10 | 1 |
| Gap days | 0 | 0 |
| Observed runs |
|
|
| Backfill points | None | Not used: every point is a daily read |
| Mismatch days | 0 | |
The provider pricing page that our daily tracker reads for this model.
Model pricing row "| Claude Sonnet 5.5 | $2 / MTok | $2.50 / MTok | $4 / MTok | $0.10 / MTok<sup>2</sup> | $10 / MTok |" shows cache hits at $0.10. Footnote 2: "Cache hits and refreshes on Claude Opus 5.5 and Claude Sonnet 5.5 are priced at 0.05x the base input price." The Prompt caching multiplier table says "0.05x on Claude Opus 5.5 and Claude Sonnet 5.5" and the text says "$0.20 USD per million tokens on Claude Opus 5.5, $0.10 USD on Claude Sonnet 5.5". Other official surfaces agree (checked 2026-10-08): claude.com/pricing lists Sonnet 5.5 prompt caching Read $0.10 / MTok, and the prompt-caching and models-overview docs give 5% for Sonnet 5.5. Same SKU and same standard tier as MPW: there is no long-context tier (Claude 4.6 and later models bill the full 1M window at standard pricing). MPW applies 0.05x to Opus 5.5 ($0.20, matches) but the old 0.1x multiplier to Sonnet 5.5 ($0.20).
fetch_url is the official .md twin of page_url (same document, also fetched by platform-claude-com-docs-en-about-claude-pricing-md). page_url itself returns markdown only when the Accept header lists text/markdown (the server sends Vary: Accept; an HTML-only Accept gets the 936 KB HTML page), so the .md twin, which returns markdown for any Accept, is fetched with an explicit accept header. Recipes read only the "## Model pricing" table: section anchors on its header row "| Model | Base input tokens | 5m cache writes | 1h cache writes | Cache hits and refreshes | Output tokens |" (the two cache-write names are wildcards), which proves the column order the patterns rely on; section_end ^(?!\|) stops at the first line that is not a table row. Each pattern ends the model name with " |" (Opus 5 cannot match Opus 5.5, Fable 5 cannot match Fable 5.1, Sonnet 5 cannot match Sonnet 5.5) and requires exactly six cells, so an added, removed or reordered column fails loudly instead of shifting fields. Page rows that MPW does not cite for this page are not tracked: Mythos 5.1, Mythos 5, Opus 4.1, Opus 4, Sonnet 4, Haiku 5.5 (two prompt-length tiers) and Haiku 3.5. Fable 5.1 is tracked by the -md source.
The third-party price history (CC BY 4.0) that this page compares with our tracker.
MPW has no price note for this model.