GCX1 wire-format benchmark scorecard

tiktoken cl100k_base (Claude 3 / Opus 4 / Sonnet 4 / Haiku 4.5 / GPT-4o family)

case	tool	bytes (json)	bytes (gcx)	Δ%	tokens (json)	tokens (gcx)	Δ%	gzip (json)	gzip (gcx)	Δ%	round-trip
01_search_symbols_small	search_symbols	720	522	−27.5%	181	125	−30.9%	219	227	+3.7%	✓
02_search_symbols_large	search_symbols	4201	2924	−30.4%	1068	742	−30.5%	850	823	−3.2%	✓
03_get_symbol_source_small	get_symbol_source	731	731	−0.0%	257	255	−0.8%	359	372	+3.6%	✓
04_get_symbol_source_large	get_symbol_source	1691	1663	−1.7%	534	532	−0.4%	678	689	+1.6%	✓
05_batch_symbols	batch_symbols	1077	702	−34.8%	335	241	−28.1%	450	423	−6.0%	✓
06_find_usages_small	find_usages	1287	989	−23.2%	335	255	−23.9%	339	327	−3.5%	✓
07_find_usages_large	find_usages	1783	920	−48.4%	569	351	−38.3%	271	261	−3.7%	✓
08_get_file_summary	get_file_summary	2172	1599	−26.4%	567	431	−24.0%	575	560	−2.6%	✓
09_analyze_hotspots	analyze_hotspots	1731	1037	−40.1%	506	318	−37.2%	500	449	−10.2%	✓
10_analyze_dead_code	analyze_dead_code	1132	825	−27.1%	288	198	−31.2%	365	355	−2.7%	✓
11_contracts_list	contracts	2296	1562	−32.0%	580	463	−20.2%	630	608	−3.5%	✓
12_get_callers_medium	get_callers	3021	2204	−27.0%	750	532	−29.1%	450	427	−5.1%	✓
13_smart_context	smart_context	1816	1178	−35.1%	471	299	−36.5%	585	494	−15.6%	✓
14_get_dependents_small	get_dependents	1269	929	−26.8%	329	239	−27.4%	318	307	−3.5%	✓
15_get_test_targets	get_test_targets	1256	997	−20.6%	311	262	−15.8%	340	357	+5.0%	✓
16_find_implementations	find_implementations	936	690	−26.3%	224	157	−29.9%	247	259	+4.9%	✓
17_find_cycles	analyze_cycles	224	192	−14.3%	87	90	+3.4%	145	165	+13.8%	✓
18_graph_stats	graph_stats	494	512	+3.6%	162	174	+7.4%	335	368	+9.9%	✓
19_get_editing_context	get_editing_context	927	708	−23.6%	233	171	−26.6%	329	318	−3.3%	✓
20_get_repo_outline	get_repo_outline	784	690	−12.0%	237	224	−5.5%	358	363	+1.4%	✓

Summary (cl100k_base): 20/20 cases. Median token savings: −27.4%. Median byte savings: −26.8%. Round-trip integrity: 20/20.

Claude Opus 4.7 (estimated (×1.35 scalar over cl100k_base))

case	tool	tokens (json)	tokens (gcx)	Δ%	source
01_search_symbols_small	search_symbols	244	169	−30.7%	est.
02_search_symbols_large	search_symbols	1442	1002	−30.5%	est.
03_get_symbol_source_small	get_symbol_source	347	344	−0.9%	est.
04_get_symbol_source_large	get_symbol_source	721	718	−0.4%	est.
05_batch_symbols	batch_symbols	452	325	−28.1%	est.
06_find_usages_small	find_usages	452	344	−23.9%	est.
07_find_usages_large	find_usages	768	474	−38.3%	est.
08_get_file_summary	get_file_summary	765	582	−23.9%	est.
09_analyze_hotspots	analyze_hotspots	683	429	−37.2%	est.
10_analyze_dead_code	analyze_dead_code	389	267	−31.4%	est.
11_contracts_list	contracts	783	625	−20.2%	est.
12_get_callers_medium	get_callers	1013	718	−29.1%	est.
13_smart_context	smart_context	636	404	−36.5%	est.
14_get_dependents_small	get_dependents	444	323	−27.3%	est.
15_get_test_targets	get_test_targets	420	354	−15.7%	est.
16_find_implementations	find_implementations	302	212	−29.8%	est.
17_find_cycles	analyze_cycles	117	122	+4.3%	est.
18_graph_stats	graph_stats	219	235	+7.3%	est.
19_get_editing_context	get_editing_context	315	231	−26.7%	est.
20_get_repo_outline	get_repo_outline	320	302	−5.6%	est.

Summary (Opus 4.7): 20/20 cases. Median token savings: −27.3%. Exact rows: 0/20 (rest estimated via ×1.35 scalar).