anthropic

Claude Sonnet 4.5

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CAPABILITY & COST

What else is worth comparing?

Claude Sonnet 4.5146.7ECI pointsEpoch Capabilities Index · 2026-10-24
$6.751M input + 250k output tokens
ECI interval 145.0–148.3 · estimates can overlap
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This modelSelected alternativesOther dots: models with both score and price
NEARBY POINT SCORE

o3

$4.00per workload146.7ECI points

-0.0 ECI points · $2.75 less
Evaluated / snapshot 2026-10-24

Compare prices & specs
Compare specifications for this selection

ECI points are estimates, not percentages. Overlapping intervals do not establish a winner. Nearby score does not mean equivalent capability.

INDEPENDENT EVALUATIONS

Results in context

Where does it sit?

Five nearest ECI estimates · current snapshot, not release-time scores.

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Overlapping intervals do not establish a clear winner. ECI combines source-selected benchmarks; points are not percentages. Snapshot 2026-10-24.

Test by test

No approved benchmark evaluation is linked to this exact model ID. Another version’s score is not substituted.

Each row is a different test, not a common difficulty scale. “Max” does not mean equal compute across providers.

What changes your bill?

Illustrative token baskets, not measured tasks.

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Short exchange1K input + 250 output tokens$0.0068
Long answer4K input + 4K output tokens$0.072
Document analysis100K input + 2K output tokens$0.33
Repeated workload1M input + 250K output tokens$6.75

List prices, captured 2026-10-25. Excludes caching, batch discounts, tools and retries. Token baskets are not estimates of a specific task’s token use.

Within the same developer

Five lowest listed workload costs, plus this model.

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Fixed basket: 1M input + 250k output. Logarithmic positions; labels show actual USD. Lower cost does not imply equivalent capability.

PUBLISHED LIMITS

Room to read
Room to respond

Context and maximum output are separate limits, not a quality score. They are not added together.

Context window1Mtokens
Maximum output64Ktokens

Published specifications

Context window1Mtokens
API input price$3USD / million tokens
API output price$15USD / million tokens
Maximum output64Kmaximum tokens per response
Output modalitiestextpublished output types
Supported parameters12API parameters listed

Model information

Provider
anthropic
Input modalities
text, image, file
Output modalities
text
Maximum output
64,000 tokens
Supported parameters
include_reasoning, max_completion_tokens, max_tokens, reasoning, response_format, stop, structured_outputs, temperature, tool_choice, tools, top_k, top_p
Added to catalogue
2025-09-29
Knowledge cutoff
2025-01-31
Catalogue snapshot
2026-10-25

Prices are per million tokens. The workload estimate uses 1,000 input and 250 output tokens. Context describes request capacity, not model quality.

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