Fahrenheit · Post-training

Environments

Reinforcement learning environments where an agent is dropped onto a running multi-service system with something broken or missing, and has to make the platform genuinely work. Grading restarts everything from the agent's own configuration, so a hand-started process or a hand-edited value scores nothing.

What is in the set

Environments8985 rated hard
Substrates35distinct running systems
Task types24across 7 categories

Frontier models do not solve these

GPT-5.534%mean over 64 environments0 fully solved
GPT-5.6 Sol20%mean over 22 environments0 fully solved
Opus 531%mean over 19 environments1 fully solved

Pass rates are measured on the shipped environments rather than estimated. Across every model evaluated, 1 environment run reached a perfect score. That headroom is the point of the set.

Categories

feature reconstruction18
scientific and ml research18
specialist algorithmic14
security hardening12
devops iac10
incident response10
migration and modernization7

How they are gated

Each environment is graded twice from source: once on the untouched broken host, and once with the reference solution applied. A stub that scores above zero would mean the task was already partly done; a reference that scores below one would mean the task is not fully solvable.

Gate evidence71 of 8918 carry none
Stub scores zeroallnothing pre-solved
Reference below 1.01of 71 measured

Read this before quoting the gate table. The supplier's own soundness document shows a sample of environments all scoring 0.0000 on the stub and 1.0000 on the reference. Across the full set that holds for the stub, but 18 of 89 environments ship no gate evidence at all, and 1 reference run scores below 1.0 (ci_pipeline_reconstruct at 0.9630).

Every environment

EnvironmentTypeDifficulty GPT-5.5GPT-5.6 SolOpus 5 StubRef
ci_pipeline_reconstruct
devops iac · sento-devops
pipeline reconstructionhard47%
k=3
––0.000.96
miso_stack_repair
devops iac · miso-devops
deployment repairhard67%
k=3
67%
k=3
–0.001.00
observability_reconstruct_blind
devops iac · sento-devops
infrastructure reconstructionhard–0%
k=8
100%
k=3
0.001.00
openelis_stack_repair
devops iac · openelis-devops
deployment repairhard33%
k=3
50%
k=4
–0.001.00
tf_aws_drift
devops iac · aws-devops
iac drift reconciliationhard56%
k=8
––0.001.00
tf_aws_migrate
devops iac · aws-devops
iac migration data safetyhard33%
k=8
––0.001.00
tf_az_stale_runbook
devops iac · azure-devops
iac reconstruction stale docshard50%
k=8
––0.001.00
tf_infra_core_repair
devops iac · sento-devops
iac reconstructionhard20%
k=3
––0.001.00
topology_reconstruct_blind
devops iac · sento-devops
infrastructure reconstructionhard33%
k=3
––0.001.00
topology_reconstruct_flow_stack
devops iac · sento-devops
infrastructure reconstructionhard–33%
k=3
–0.001.00
aria_acp8_codec
feature reconstruction · aria
vector reconstruction f2phard–––0.001.00
aria_acp8_codec__spec
feature reconstruction · aria
vector reconstruction f2phard–––0.001.00
compute_engine_symbolic
feature reconstruction · compute-engine
repo unit test f2phard22%
k=6
––0.001.00
compute_engine_symbolic__spec
feature reconstruction · compute-engine
repo unit test f2phard8%
k=6
––0.001.00
dominion_engine
feature reconstruction · ruby-dominion
feature implementation f2phard17%
k=4
––0.001.00
dominion_engine__spec
feature reconstruction · ruby-dominion
feature implementation f2phard17%
k=4
––0.001.00
fineract_progressive_emi_engine
feature reconstruction · fineract
feature implementation f2phard67%
k=6
––0.001.00
fineract_progressive_emi_engine__spec
feature reconstruction · fineract
feature implementation f2phard59%
k=10
––0.001.00
flow_notifications_subsystem
feature reconstruction · sento-flow-backend
feature implementation f2phard39%
k=5
––0.001.00
flow_notifications_subsystem__spec
feature reconstruction · sento-flow-backend
feature implementation f2phard46%
k=5
––0.001.00
flow_workflows_activities_subsystem
feature reconstruction · sento-flow-backend
feature implementation f2phard31%
k=10
––0.001.00
flow_workflows_activities_subsystem__spec
feature reconstruction · sento-flow-backend
feature implementation f2phard35%
k=5
––0.001.00
goby_battle_engine
feature reconstruction · goby
feature implementation f2phard–––0.001.00
goby_battle_engine__spec
feature reconstruction · goby
feature implementation f2phard–––0.001.00
javamod_tracker_replay
feature reconstruction · javamod
feature implementation f2phard36%
k=6
––0.001.00
javamod_tracker_replay__spec
feature reconstruction · javamod
feature implementation f2phard40%
k=6
––0.001.00
x18xx_step_mechanics
feature reconstruction · x18xx
feature implementation f2phard11%
k=5
––0.001.00
x18xx_step_mechanics__spec
feature reconstruction · x18xx
feature implementation f2phard12%
k=5
––0.001.00
incident_crosstenant_hardened
incident response · sento-flow-backend
security demonstrate then patchhard9%
k=8
––0.001.00
incident_crosstenant_hardened__spec
incident response · sento-flow-backend
security demonstrate then patchhard21%
k=8
––0.001.00
incident_xsub_dsn
incident response · sento-flow-backend
incident responsehard53%
k=9
––0.001.00
incident_xsub_dsn__spec
incident response · sento-flow-backend
incident responsehard33%
k=9
––0.001.00
incident_xsub_prepared_xact
incident response · sento-flow-backend
incident responsehard17%
k=9
––0.001.00
incident_xsub_prepared_xact__spec
incident response · sento-flow-backend
incident responsehard23%
k=9
––0.001.00
incident_xsub_searchpath
incident response · sento-flow-backend
incident responsehard41%
k=9
––0.001.00
incident_xsub_searchpath__spec
incident response · sento-flow-backend
incident responsehard40%
k=9
––0.001.00
incident_xsubsystem_onboarding
incident response · sento-flow-backend
incident responsehard24%
k=9
––0.001.00
incident_xsubsystem_onboarding__spec
incident response · sento-flow-backend
incident responsehard16%
k=9
––0.001.00
async_executor_runtime_migration
migration and modernization · async-artifact
constructed migrationhard62%
k=3
––0.001.00
mocha_chai_to_node_test
migration and modernization · karma-migrate
constructed migrationmedium66%
k=8
––0.001.00
mocha_chai_to_node_test__terse
migration and modernization · karma-migrate
constructed migrationmedium0%
k=8
––0.001.00
quickcheck_to_proptest
migration and modernization · itertools-migrate
constructed migrationmedium2%
k=8
––0.001.00
rxjava3_jdk21_multi_project_migration
migration and modernization · rxjava3-composite
constructed migrationhard14%
k=3
––0.001.00
scala3_macro_migration
migration and modernization · muster-scala
constructed migrationhard52%
k=5
––0.001.00
upgrade_rn_0_74_to_0_80
migration and modernization · lovewick-rn
long horizon upgradehard–––0.001.00
battery_aging_regime_shift
scientific and ml research · sciml-realdata
real data regime shift forecasthard–0%
k=3
32%
k=6
––
bore_flux_tomography
scientific and ml research · sciml-bench
scientific inverse problemhard–20%
k=3
27%
k=3
––
coat_stack_admittance_c
scientific and ml research · sciml-bench
synthetic structure identificationhard–7%
k=6
28%
k=6
––
coat_stack_admittance_f
scientific and ml research · sciml-bench
synthetic structure identificationhard–13%
k=3
19%
k=3
––
coat_stack_admittance_id
scientific and ml research · sciml-bench
synthetic structure identificationhard–30%
k=6
58%
k=5
––
congestion_service_id
scientific and ml research · sciml-bench
synthetic structure identificationhard–61%
k=3
69%
k=3
––
dark_species_kinetics
scientific and ml research · sciml-bench
synthetic structure identificationhard–9%
k=3
10%
k=3
––
diffusivity_profile_id
scientific and ml research · sciml-bench
synthetic structure identificationhard–22%
k=3
24%
k=3
––
frame_hysteresis_id
scientific and ml research · sciml-bench
synthetic structure identificationhard–5%
k=3
11%
k=3
––
kepler_transit_timing_injection
scientific and ml research · sciml-realdata
real data injection recoveryhard–16%
k=3
17%
k=3
––
latent_basin_transfer_opt
scientific and ml research · ml-method
benchmark ml methodhard–12%
k=3
32%
k=3
––
layered_contact_thermography
scientific and ml research · sciml-bench
synthetic structure identificationhard–15%
k=3
15%
k=3
––
ligo_strain_injection_recovery
scientific and ml research · sciml-realdata
real data injection recoveryhard–10%
k=3
14%
k=3
––
multifidelity_transfer_opt
scientific and ml research · ml-method
benchmark ml methodhard–2%
k=3
1%
k=3
––
noisy_constrained_transfer_opt
scientific and ml research · ml-method
benchmark ml methodhard–1%
k=3
19%
k=3
––
slab_phase_tomography
scientific and ml research · sciml-bench
synthetic structure identificationhard–15%
k=3
59%
k=3
––
sparse_diffusion_reaction_reconstruction
scientific and ml research · pdebench-inverse
scientific inverse pderesearch–28%
k=3
41%
k=3
––
terminal_device_id
scientific and ml research · sciml-bench
synthetic system identificationhard–23%
k=3
17%
k=3
––
sec_access_control_permission_system
security hardening · brodboksen-backend
security access controlhard49%
k=9
––0.001.00
sec_access_control_permission_system__terse
security hardening · brodboksen-backend
security access controlhard37%
k=9
––0.001.00
sec_access_policy_compiler
security hardening · gaterail
security access controlhard40%
k=4
––0.001.00
sec_access_policy_compiler__terse
security hardening · gaterail
security access controlhard40%
k=4
––0.001.00
sec_detection_rule_compiler
security hardening · sentryql
security query constructionhard44%
k=4
––0.001.00
sec_detection_rule_compiler__terse
security hardening · sentryql
security query constructionhard44%
k=4
––0.001.00
sec_filter_sql_query_builder
security hardening · brodboksen-backend
security query constructionhard38%
k=11
––0.001.00
sec_filter_sql_query_builder__terse
security hardening · brodboksen-backend
security query constructionhard31%
k=10
––0.001.00
sec_log_normalizer
security hardening · normalog
security log normalizationhard33%
k=4
––0.001.00
sec_log_normalizer__terse
security hardening · normalog
security log normalizationhard25%
k=4
––0.001.00
sec_waf_rule_compiler
security hardening · wafforge
security query constructionhard40%
k=4
––0.001.00
sec_waf_rule_compiler__terse
security hardening · wafforge
security query constructionhard40%
k=4
––0.001.00
cavalier_offset_kernel
specialist algorithmic · cavc-geometry-kernel
feature implementation f2phard43%
k=9
––0.001.00
cavalier_offset_kernel__spec
specialist algorithmic · cavc-geometry-kernel
feature implementation f2phard34%
k=8
––0.001.00
llnl_units_string_parser
specialist algorithmic · llnl-units
feature implementation f2phard29%
k=8
––0.001.00
llnl_units_string_parser__terse
specialist algorithmic · llnl-units
feature implementation f2phard19%
k=9
––0.001.00
retroboy_gb_apu
specialist algorithmic · retroboy
feature implementation f2phard33%
k=8
––0.001.00
retroboy_gb_apu__terse
specialist algorithmic · retroboy
feature implementation f2phard33%
k=4
––0.001.00
soundfont_synth
specialist algorithmic · spessasynth
feature implementation f2phard26%
k=4
––0.001.00
soundfont_synth__terse
specialist algorithmic · spessasynth
feature implementation f2phard26%
k=4
––0.001.00
symengine_equation_solver
specialist algorithmic · symengine
feature implementation f2phard25%
k=4
––0.001.00
symengine_equation_solver__terse
specialist algorithmic · symengine
feature implementation f2phard9%
k=8
––0.001.00
ym2612_fm_synthesis
specialist algorithmic · jgenesis
feature implementation f2phard42%
k=8
––0.001.00
ym2612_fm_synthesis__terse
specialist algorithmic · jgenesis
feature implementation f2phard38%
k=8
––0.001.00
ym2612_opn2_fm
specialist algorithmic · helios
feature implementation f2phard40%
k=4
––0.001.00
ym2612_opn2_fm__terse
specialist algorithmic · helios
feature implementation f2phard43%
k=4
––0.001.00