Clinical Benchmarks
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GPT-6.1 Terra

Released 26 Oct 2026$1 input, $5 output per million tokens1.05M contextproprietaryAlso written as GPT 6.1 Terra, gpt-6.1-terra, GPT-6.1 Terra Pro, openai/gpt-6.1-terra-pro

1 result on 1 of 13 boards, latest measured Oct 2026. Compare with other models

Clinical Benchmarks Index53.5Rank 26 of 1531 of 10 boardsThis site’s own calculation. Show the 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
    OpenAI; length-adjusted; 62.7 (64.2, 2531) (adjusted, raw, mean response characters); addendum Table 5 refers to the GPT-6 Astra card for method
    0.627
    Rank 10 of 43Leader GPT-6 Astra (Anthropic run) 0.703
    Vendor-reported
    Measured Oct 2026

Index working

Show the working: each board’s result, how hard the board runs and the field average

The Clinical Benchmarks Index is this site's own calculation from 10 boards. How it is computed

  • HealthBench Professional0.62762.7+1.0 easy board61.70.743 weightOpenAI; length-adjusted; 62.7 (64.2, 2531) (adjusted, raw, mean response characters); addendum Table 5 refers to the GPT-6 Astra card for method
Adjusted result, one board
61.7
Field average, counts for 60% with 1 of 10 boards
48.1
Index
= 53.5

Score: the result on the board’s own 0 to 100 scale (dot; tick: the board’s leader). Board runs: how far the board’s scores sit above or below the same models’ scores on the other boards. Adjusted: the score minus that offset. The index is the adjusted average with the field average mixed in, more of it the fewer boards a model has. 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 1 result
  1. 10HealthBench Professional length-adjusted 0.627
    Printed as 62.7Vendor-reported, measured Oct 2026Configuration: OpenAI; length-adjusted; 62.7 (64.2, 2531) (adjusted, raw, mean response characters); addendum Table 5 refers to the GPT-6 Astra card for method
    Addendum to GPT-6 Astra System Card: GPT-6.1 Terra system card, OpenAI, 26 Oct 2026. Section 5.1, Table 5, HealthBench Professional length-adjusted, GPT-6.1 Terra column
    EVALUATION GPT-5.5 GPT-5.6-SOL GPT-5.6-TERRA GPT-5.6-LUNA GPT-6 ASTRA GPT-6-SOL GPT-6-LUNA GPT-6.1-SOL GPT-6.1-TERRA HealthBench Professional length-adjusted 51.8 (57.2, 3818) 60.5 (64.1, 3228) 57.7 (62.4, 3618) 55.7 (59.8, 3389) 64.7 (68.2, 3185) 60.8 (59.5, 1573) 60.8 (61.2, 2119) 64.2 (67.2, 3038) 62.7 (64.2, 2531)
    Every result from this document

Other OpenAI models: GPT-4.1, GPT-4.1 mini, GPT-4o, GPT-5, GPT-5.1, GPT-5.2, GPT-5.3-Codex, GPT-5.4, GPT-5.4 mini, GPT-5.4 nano, GPT-5.5, GPT-5.5 Instant, GPT-5.6 Luna, GPT-5.6 Sol, GPT-5.6 Terra, GPT-5 mini, GPT-5 nano, GPT-6.1 Sol, GPT-6 Astra, GPT-6 Luna, GPT-6 Sol, GPT OSS 120B, GPT OSS 20B, o3, o4-mini