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Claude Haiku 5.5

Released 7 Oct 2026$0.1 input, $0.5 output per million tokens1M contextproprietaryAlso written as anthropic/claude-haiku-5.5, anthropic.claude-haiku-5-5, claude-haiku-5-5, Haiku 5.5

6 results on 2 of 13 boards, latest measured Oct 2026. Compare with other models

Clinical Benchmarks Index30.9Rank 51 of 1492 of 10 boardsAverage × multiplier 53.6 × 0.577 = 30.9This site’s own calculation. Working How it is computed

Results

Each line sits on its own board's scale. Tall tick: the board leader.

Clinical reasoning and knowledge

  1. HealthBench Professional
    Anthropic; max effort; Opus 4.8 grader; safety classifiers enabled; length-adjusted; raw 71.0%; five runs (October 1 and 2); thirteen repeat max runs on October 4 averaged 64.2%
    0.648
    Rank 6 of 35Leader GPT-6 Astra (Anthropic run) 0.703
    Vendor-reported
    Measured Oct 2026

EHR and workflow agents

  1. PhysicianBench
    Anthropic harness; 100 tasks; pass@1; max effort; Opus 5 rubric grader; safety classifiers enabled; five attempts per task; run October 1 and 2
    43.0
    Rank 8 of 28 here, 12 models on the boardLeader Claude Opus 5.5 (max) 68.4
    Vendor-reported
    Measured Oct 2026
  2. PhysicianBench
    Anthropic harness; 100 tasks; pass@1; xhigh effort; Opus 5 rubric grader; safety classifiers enabled; five attempts per task; run October 5
    35.8
    Rank 10 of 28 here, 12 models on the boardLeader Claude Opus 5.5 (max) 68.4
    Vendor-reported
    Measured Oct 2026
  3. PhysicianBench
    Anthropic harness; 100 tasks; pass@1; high effort; Opus 5 rubric grader; safety classifiers enabled; five attempts per task; run October 5
    31.6
    Rank 13 of 28 here, 12 models on the boardLeader Claude Opus 5.5 (max) 68.4
    Vendor-reported
    Measured Oct 2026
  4. PhysicianBench
    Anthropic harness; 100 tasks; pass@1; medium effort (API default); Opus 5 rubric grader; safety classifiers enabled; five attempts per task; run October 5
    25.2
    Rank 18 of 28 here, 12 models on the boardLeader Claude Opus 5.5 (max) 68.4
    Vendor-reported
    Measured Oct 2026
  5. PhysicianBench
    Anthropic harness; 100 tasks; pass@1; low effort; Opus 5 rubric grader; safety classifiers enabled; five attempts per task; run October 5
    17.8
    Rank 21 of 28 here, 12 models on the boardLeader Claude Opus 5.5 (max) 68.4
    Vendor-reported
    Measured Oct 2026

Index working

The Clinical Benchmarks Index is this site's own calculation: a weighted average of the board scores times a multiplier for the boards behind it. How it is computed

  • HealthBench Professional0.64864.8×0.743Anthropic; max effort; Opus 4.8 grader; safety classifiers enabled; length-adjusted; raw 71.0%; five runs (October 1 and 2); thirteen repeat max runs on October 4 averaged 64.2%
  • PhysicianBench43.043.0×0.79Anthropic harness; 100 tasks; pass@1; max effort; Opus 5 rubric grader; safety classifiers enabled; five attempts per task; run October 1 and 2
Weighted average of 2 boards
53.6
Multiplier for 2 of 10 boards
× 0.577
Index
53.6 × 0.577 = 30.9

Score: the result on the board’s own 0 to 100 scale. Dot: this model; tick: the board’s leader. Weight: how much the board counts in the weighted average. Each result links to its quote and page; the line under it is the setting it was measured with.

Sources

The quote, page and document for each of the 6 results
  1. 6HealthBench Professional max effort 0.648
    Printed as 64.8%Vendor-reported, measured Oct 2026Configuration: Anthropic; max effort; Opus 4.8 grader; safety classifiers enabled; length-adjusted; raw 71.0%; five runs (October 1 and 2); thirteen repeat max runs on October 4 averaged 64.2%
    Claude Haiku 5.5 System Card system card, Anthropic, 7 Oct 2026. p. 133, Section 8.11.3; same value in p. 111, Table 8.1.A, row HealthBench Professional (Length-adjusted), column Haiku 5.5 (printed 64.8) and p. 132, Figure 8.11.1.A
    Max effort scored highest, at 64.8% (71.0% raw); thirteen repeat runs at max on October 4, the day of the lower levels, averaged 64.2%.
    Every result from this document
  2. 8PhysicianBench Anthropic harness 43.0
    Printed as 43.0%Vendor-reported, measured Oct 2026Configuration: Anthropic harness; 100 tasks; pass@1; max effort; Opus 5 rubric grader; safety classifiers enabled; five attempts per task; run October 1 and 2
    Claude Haiku 5.5 System Card system card, Anthropic, 7 Oct 2026. pp. 132-133, Section 8.11.2, Figure 8.11.2.A caption and paragraph; also p. 133, Section 8.11.3
    PhysicianBench is a public benchmark of 100 physician tasks carried out in an electronic health record (EHR). Claude Haiku 5.5 passed 43.0% of attempts (five attempts on each task).
    Every result from this document
  3. 10PhysicianBench Anthropic harness 35.8
    Printed as 35.8%Vendor-reported, measured Oct 2026Configuration: Anthropic harness; 100 tasks; pass@1; xhigh effort; Opus 5 rubric grader; safety classifiers enabled; five attempts per task; run October 5
    Claude Haiku 5.5 System Card system card, Anthropic, 7 Oct 2026. p. 133, Section 8.11.3; p. 134, Figure 8.11.3.A PhysicianBench panel
    On PhysicianBench (five attempts per task at each level), Haiku 5.5 passed 17.8% of attempts at low, 25.2% at medium, 31.6% at high, 35.8% at xhigh and 43.0% at max.
    Every result from this document
  4. 13PhysicianBench Anthropic harness 31.6
    Printed as 31.6%Vendor-reported, measured Oct 2026Configuration: Anthropic harness; 100 tasks; pass@1; high effort; Opus 5 rubric grader; safety classifiers enabled; five attempts per task; run October 5
    Claude Haiku 5.5 System Card system card, Anthropic, 7 Oct 2026. p. 133, Section 8.11.3; p. 134, Figure 8.11.3.A PhysicianBench panel
    On PhysicianBench (five attempts per task at each level), Haiku 5.5 passed 17.8% of attempts at low, 25.2% at medium, 31.6% at high, 35.8% at xhigh and 43.0% at max.
    Every result from this document
  5. 18PhysicianBench Anthropic harness 25.2
    Printed as 25.2%Vendor-reported, measured Oct 2026Configuration: Anthropic harness; 100 tasks; pass@1; medium effort (API default); Opus 5 rubric grader; safety classifiers enabled; five attempts per task; run October 5
    Claude Haiku 5.5 System Card system card, Anthropic, 7 Oct 2026. p. 133, Section 8.11.3; p. 134, Figure 8.11.3.A PhysicianBench panel
    On PhysicianBench (five attempts per task at each level), Haiku 5.5 passed 17.8% of attempts at low, 25.2% at medium, 31.6% at high, 35.8% at xhigh and 43.0% at max.
    Every result from this document
  6. 21PhysicianBench Anthropic harness 17.8
    Printed as 17.8%Vendor-reported, measured Oct 2026Configuration: Anthropic harness; 100 tasks; pass@1; low effort; Opus 5 rubric grader; safety classifiers enabled; five attempts per task; run October 5
    Claude Haiku 5.5 System Card system card, Anthropic, 7 Oct 2026. p. 133, Section 8.11.3; p. 134, Figure 8.11.3.A PhysicianBench panel
    On PhysicianBench (five attempts per task at each level), Haiku 5.5 passed 17.8% of attempts at low, 25.2% at medium, 31.6% at high, 35.8% at xhigh and 43.0% at max.
    Every result from this document

Other Anthropic models: Claude 3.7 Sonnet, Claude Fable 5, Claude Fable 5.1, Claude Haiku 4.5, Claude Opus 4.1, Claude Opus 4.5, Claude Opus 4.6, Claude Opus 4.7, Claude Opus 4.8, Claude Opus 5, Claude Opus 5.5, Claude Sonnet 4, Claude Sonnet 4.5, Claude Sonnet 4.6, Claude Sonnet 5, Claude Sonnet 5.5